Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ef4acd2f6c2353…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 10:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fbf2fe87c4b324a24cbb56e3e315b5b SHA-1: 7ab2d8fd1a6726a52e7168ab0379ca11a5be5afa SHA-256: 28ef4acd2f6c235398a7d4a52ee0b0a945027c64c28d81a0a11a39bc3c155315
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. The document body, though malformed, contains text related to 'social learning theory' and the wkhtmltopdf tool, suggesting a lure to disguise malicious content. The primary attack vector appears to be directing users to malicious infrastructure via the embedded links.

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=que+es+la+teoria+del+aprendizaje+social+pdf
    • http://files.icemtn.com/uploads/1/3/0/8/130814644/xifave.pdf
    • http://putev.ledandminis.com/uploads/1/3/0/7/130775612/ximetujuz-menokiwara-tagetufijemidi.pdf
    • http://files.cwhypnotherapy.com/uploads/1/3/1/4/131454482/7436231.pdf
    • http://files.jacqueleneambrosedesign.com/uploads/1/3/0/7/130775297/rasavonazuso.pdf
    • http://files.northyorkmoorstourism.com/uploads/1/3/1/3/131381607/5900410.pdf
    • https://cdn.shopify.com/s/files/1/0434/7651/7014/files/97650422809.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/3707115437.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/vulkan_vs_directx.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8903/files/77813492195.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/rolofomogizezil.pdf
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/xewepotinuvuzovam.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/50340307987.pdf
    • https://cdn.shopify.com/s/files/1/0446/5645/9939/files/catalogo_price_shoes_escolar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/99131898979.pdf
    • https://cdn.shopify.com/s/files/1/0440/6309/6984/files/siwokawaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79086372433.pdf
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/niwekididizapoduvofu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/zizelebivojefubowumegok.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_off00006e57.bin
2eff443de21e1707d04ae841343d81b5e765dd471f951adc7d771088364ab1e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E57 5336 bytes
font_01_sfnt_off0000809f.bin
326cc38e06fff71feeba9c1a4316a311b1f00b5b69dd46f9a5789ef5b0dc8466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x809F 10776 bytes

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