Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a74bd71c959b09a…

MALICIOUS

PDF

45.0 KB Created: 2020-08-23 17:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 199c88cbfa6c62072641c3554c90c4ca SHA-1: 53e5eb4f88c8960ba8174837d12da320f07f1910 SHA-256: 6a74bd71c959b09ab9cb6aa27bcef0e6522fda5291f4773c76d198ea4d69f616
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to lure users to external malicious sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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.com/pify?keyword=germes+a%25C3%25A9robies+m%25C3%25A9sophiles+pdf
    • http://nemami.lilylarue.com/uploads/1/3/1/3/131383483/3a253e.pdf
    • http://files.gemmiev.com/uploads/1/3/2/6/132681482/fumerexitit_watiwo_tibaniruwed_pawuful.pdf
    • http://files.nathanpalmangus.com/uploads/1/3/1/4/131454304/sibineta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6841/5400/files/cahier_des_charges_application_informatique.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/what_does_acquiesce_mean_in_a_sentence.pdf
    • https://cdn.shopify.com/s/files/1/0437/3518/7605/files/65328276643.pdf
    • https://cdn.shopify.com/s/files/1/0440/4976/0406/files/5.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/39770430269.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/35890099843.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6917/files/rockstar_lyrics_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0433/4967/2091/files/matudabuvawikilal.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/jerefovakewemobosetikona.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2150/8509/files/keturevukugari.pdf
    • https://cdn.shopify.com/s/files/1/0433/3839/9912/files/66635506671.pdf
    • https://cdn.shopify.com/s/files/1/0434/4800/8866/files/92918836170.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de2.bin
449e5836b66725171b43b4d22aa1756a25df224017165918eef7805df73932d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE2 5592 bytes
font_01_sfnt_off00008078.bin
2263ca081e44ea64f18883b112427794b88504bfb2178d23d8f19b3afa0041c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8078 11764 bytes

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