Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f853ddfc7ad783…

MALICIOUS

PDF

50.3 KB Created: 2020-08-17 13:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 557bf9896bd043f8823fcff4fa2247ee SHA-1: 165283a3315ab2b93526ba16204108fb3241faf0 SHA-256: 31f853ddfc7ad783abfc84fab667a2fd36836900bebea802bd34f2a722f3aaa3
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic match for a malicious redirector link and a link farm, indicating an attempt to drive traffic to malicious infrastructure. The document body includes a call-to-action phrase, reinforcing the lure. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ews+affidavit+format+in+english In PDF document text
    • http://files.spotlightseniorserviceslasvegas.com/uploads/1/3/1/3/131398428/zixuxuwesidusuduv.pdfIn PDF document text
    • http://xinalabo.fosterenterprises.com/uploads/1/3/0/9/130969054/mofutadisadupatizil.pdfIn PDF document text
    • http://resozed.georgethequarter.com/uploads/1/3/2/6/132681862/ralufotelu-pogiporakage-telenaseg-zubefabezog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/school_accountant_job_description.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4230/8250/files/guxizolagizunojirag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/na_step_working_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/52002061328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4980/3166/files/begifojozovomojabezubamo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/10485500894.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/bone_marrow_aspiration_and_biopsy_procedure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/vosemovutukopufol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/cbse_maths_book_class_10_solutions_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4463/3750/files/59097287689.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/52590835885.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0032/3486/files/rakejuxetekarixog.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000797b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797B 5428 bytes
SHA-256: 28ec0c4746f27740f418e82496714e41f39711527b105a0490f8d8a2ed57c637
font_01_sfnt_off00008bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDE 10672 bytes
SHA-256: 9b146d2c934a520784f0f7b6292e1f5d041a2829592921f2dce155884f7dc4d3
font_02_sfnt_off0000b081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB081 2808 bytes
SHA-256: 2573663731bd43408ba2f021839d35c95f105c70180fb649f07e447f7f39196e