Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dcabffb17f8267…

MALICIOUS

PDF

117.4 KB Created: 2020-08-17 00:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 44afc415e8a81eec4a9ab2e9b3747317 SHA-1: cfda05ad674857fdd4174fe99e8c06cd28414bf2 SHA-256: 83dcabffb17f8267c4982cc28750c8f09d6094d126b3b85b5dd861527ed77194
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.ru) disguised as a link farm. This indicates a phishing or malware distribution attempt, likely using the embedded links to direct users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=c.+a.+t+uniforms+philippines In PDF document text
    • http://files.thehqha.org/uploads/1/3/2/6/132681969/giwesozuvowar.pdfIn PDF document text
    • http://files.symmetry-careers.com/uploads/1/3/1/4/131454699/razulil.pdfIn PDF document text
    • http://files.sierralovestowell.com/uploads/1/3/1/0/131071298/1f05af97.pdfIn PDF document text
    • http://files.roseebudsllc.com/uploads/1/3/2/7/132711961/najivefawipela_goruzat.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7207/5414/files/raxisu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4403/5993/files/routing_algorithms_in_computer_networks_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8589/6609/files/seus_shaders_1._7._10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/ashrae_handbook_2020_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/nonadulidozumadujome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/timpanometria_de_alta_frecuencia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/cancer_de_prostata_imss.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58085676994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4117/5190/files/los_riesgos_psicosociales_y_el_estrs_en_el_trabajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3204/2920/files/dasixux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/89764259895.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/english_thesaurus_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3155/1400/files/expanding_tactics_for_listening_3rd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4659/0872/files/ascii_code_table.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001891d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1891D 9016 bytes
SHA-256: 2d12ecae43cadaf4db8ed8b0674eb499b75cc4aad98a0fdbd9ffca2af1ec9a66
font_00_sfnt_off00016044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16044 6888 bytes
SHA-256: 3a77c431143dc4067c5b8ebdb22d874bdbeeb5c2482ce2bd23cdd4a1aca87083
font_01_sfnt_off00017803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17803 5080 bytes
SHA-256: a345e5c43f75341842fd38977b235e813b4c59d4b5971b5c916d7f5150adc3f5
font_03_sfnt_off0001a268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A268 10780 bytes
SHA-256: d280a237497424d0c0c3a0f9f2d874dbb3149b40aae1fed7d7790afee14fa701