Malicious PDF — malware analysis report

Static analysis result for SHA-256 720ea9c8af574d03…

MALICIOUS

PDF

46.0 KB Created: 2020-08-25 14:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ccfe2756829094e03b415496c723776 SHA-1: 8822424e531b52315ff0d114c7a3f231587698a1 SHA-256: 720ea9c8af574d03e99158be8bf32014fce053c78519241a0a4fb1ae27444d19
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or phishing lure. The document body text, while appearing as a search query, is likely a pretext to disguise the malicious links. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards an attempt to redirect the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=say+something+piano+chords+sheet+music+free
    • http://diripaki.braemarmensclub.com/uploads/1/3/1/4/131438563/1693716.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4241/4492/files/livre_guide_du_routard_espagne.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/92361116021.pdf
    • https://cdn.shopify.com/s/files/1/0435/8547/0627/files/bosagapubemutivozukolu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/irrigation_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nijudesiko.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/avik_sarkar_bhog.pdf
    • https://cdn.shopify.com/s/files/1/0445/6975/5812/files/40th_birthday_party_invite_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3155/1400/files/characteristics_of_a_good_research_proposal.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/18907516852.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/20491613847.pdf
    • https://cdn.shopify.com/s/files/1/0437/9174/5175/files/difference_between_alternator_and_generator.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/58116694107.pdf
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/todaxatozasimefegod.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_off00005b97.bin
fc0698294cb3f25e30d17b1cd8cde455184960437c471ef02e28901cb4f83c2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B97 5624 bytes
font_01_sfnt_off00006e8b.bin
8db1900020391ba150ab6a79f3191a30fe098a912e3ce43f79eb9ba5b0c6f56c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8B 14580 bytes
font_02_sfnt_off00009cc8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CC8 4324 bytes

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