Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cb1c832ce266d4…

MALICIOUS

PDF

42.8 KB Created: 2020-08-19 05:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d6f14d738a9c2050b1170bf42e925c SHA-1: 134423b2d9f89e9fa9d844151e9d13a724015f32 SHA-256: f1cb1c832ce266d4eb42f7dfc8a7b2051f8e21724258a61fc14db8784e270f36
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and several other URLs hosted on Shopify, suggesting a link farm or SEO poisoning attempt to lure users to malicious 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=5+meo+dmt+trip+report
    • http://files.arizonafiberartsretreat.com/uploads/1/3/1/4/131409442/roxetebo.pdf
    • http://bitefak.starkhowell.com/uploads/1/3/1/4/131410685/c83953.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/79333222729.pdf
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/56663611543.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/31251099697.pdf
    • https://cdn.shopify.com/s/files/1/0433/6025/6159/files/59179805745.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1923/files/8035946678.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7098/files/wosaxon.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/deductive_and_inductive_learning.pdf
    • https://cdn.shopify.com/s/files/1/0429/0209/3987/files/bhagat_singh_college_admission_form_2017.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/narajelewawaxasofojusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/82388151676.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/bingo_card_generator.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8246/files/apprendre_a_parler_le_francais.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006127.bin
ad4af860cefb30aa6869cad413255278b33687051e954d115036abb954a702e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6127 4716 bytes
font_01_sfnt_off00007112.bin
c781990768fc3a1e0f56c32bf1317fcef25dcb66e3c4a3b3e9487c7a10402c47
pdf-font-stream PDF embedded font (sfnt) at offset 0x7112 13944 bytes