Malicious PDF — malware analysis report

Static analysis result for SHA-256 779e404e8561f1d5…

MALICIOUS

PDF

53.4 KB Created: 2020-08-22 18:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e35269281351ba9bb9b780bd64ee86b8 SHA-1: 90cd0b9700a5d81d5c25423e76575f7c6ec3a6c4 SHA-256: 779e404e8561f1d58bf353ec33b214885a5a46a4416a87b9273b2b549836e807
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains the URL for this redirector. This suggests the primary goal is to trick the user into navigating to malicious infrastructure, likely to deliver a secondary payload or phish for credentials.

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.
  • 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.com/pify?keyword=bhakti+song+2018+video++mp4
    • http://nuwakaf.lanzaroteboathotel.com/uploads/1/3/1/6/131606263/1056576.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/8447/1719/files/applied_partial_differential_equations_haberman_5th.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/pasar_de_a_word_gratis_y_rapido.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/24596218752.pdf
    • https://cdn.shopify.com/s/files/1/0439/2720/8091/files/earthing_sheet_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5861/files/64845437530.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7933/files/mercedes_e_class_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/physical_science_curriculum_guide_senior_high_deped.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/96057120329.pdf
    • https://cdn.shopify.com/s/files/1/0440/7413/9800/files/new_amharic_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0452/8907/8946/files/niwibopinedoxorikavalodoj.pdf
    • https://cdn.shopify.com/s/files/1/0436/0113/3731/files/responsible_parenthood_and_family_planning_resource_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0431/7714/8571/files/pusifawifiwipugega.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/45653543334.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069b1.bin
af8fb4b354a4f141f21b77963070371338c57deeadace5226843be1ddd4610aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B1 6028 bytes
font_01_sfnt_off00007e11.bin
6f5f6e35166dd7be9e64fea9e2e45b0959250310f8733b37c5fd0bdbb732046b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E11 15152 bytes
font_02_sfnt_off0000ad49.bin
eb0e69947b933513bb87a9e44135fcca9d75a687c69451db5861851c766107fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD49 8668 bytes

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