Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c503bf01e7c7e9…

MALICIOUS

PDF

41.8 KB Created: 2020-08-06 17:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f30fab5bdb07630338e6a22594f1dbf SHA-1: a34e495043188fe0b14c457c3947c01b6b7a31bb SHA-256: 13c503bf01e7c7e93ca364180110dbe0e35ad9aee2711738596bcb7ad18508c4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=acca+f9+revision+notes+pdf`. The document body, though heavily obfuscated, contains text related to 'revision notes' and the malicious URL, indicating a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of malicious redirector links and the link farm structure strongly suggests a malicious intent to redirect users 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=acca+f9+revision+notes+pdf
    • http://files.mattduffybaseball.com/uploads/1/3/1/3/131380786/2b6f90e42.pdf
    • http://files.veronicablight.com/uploads/1/3/2/6/132695755/kologanalovoxosiv.pdf
    • http://files.lindawilliamsjewelry.com/uploads/1/3/1/6/131606094/fomoxe_gowazip_ribizur_fotudobugodiri.pdf
    • http://files.centerstudiovt.com/uploads/1/3/1/4/131437792/991047.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/wotofuzurif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6689/files/32507677390.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2714/files/systme_bielle_manivelle_exercice_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0433/8604/4572/files/rozekisatovegawux.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/zosizasuji.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/15089928045.pdf
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/44384454557.pdf
    • https://cdn.shopify.com/s/files/1/0434/7458/3702/files/67717158273.pdf
    • https://cdn.shopify.com/s/files/1/0428/6332/9446/files/39520648978.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/alfred_marshall_biografia.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/rizufizileloz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/21076102464.pdf
    • https://cdn.shopify.com/s/files/1/0437/3531/8689/files/kizovepebirelawerebas.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_off0000580d.bin
6420cd06ccf592c87fb7af05945e3bc6c165055a967ff64f5e8cbb884acce492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x580D 5108 bytes
font_01_sfnt_off0000697a.bin
17de4d58764143da0c88afddd300977b6fb802152ce048f5c356a2615e04af1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697A 10064 bytes
font_02_sfnt_off00008bd9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD9 4324 bytes

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