Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed1a6a518daaea1…

MALICIOUS

PDF

76.6 KB Created: 2020-08-14 13:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad93b0d2dd87aa65400df6c8bb270417 SHA-1: f38719e5100a9566068b81bb7b4b1c3b81253e06 SHA-256: 0ed1a6a518daaea1ed1cb671e0ab764cc15352f4d56850f1f7f2187fe5dbeffa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service (ttraff.com) which is flagged as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

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=cooling+gel+sheets+for+adults
    • http://files.raincoatrun.com/uploads/1/3/2/6/132695351/37652c98559.pdf
    • http://files.javtv.com/uploads/1/3/1/3/131383514/1855372.pdf
    • http://files.prudencemacleod.com/uploads/1/3/1/4/131407698/niziretetaxux_gusogoxirepiw_pumarenu_vesukali.pdf
    • http://files.inspiredemocracy.org/uploads/1/3/2/7/132712093/vaminov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/kovawunasiroro.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/zutegubiwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73875000904.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/jovidota.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/47604333398.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/19176860255.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7294/files/64658087754.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/8731262420.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5366/files/86099661012.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/86712001203.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/bacterial_bioremediation.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7980/files/zutolanofufetilika.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6828/files/togupox.pdf
    • https://cdn.shopify.com/s/files/1/0437/3371/3050/files/48906713809.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_off0000efec.bin
7a875dfb5eb5fc8f27cb3d188211c28b42d84bd0a81f480310b246d786d94da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 5072 bytes
font_01_sfnt_off00010124.bin
274ce321044e9b72cb6746ecde05d6d7352c97f72c3a10b58f1a34f471b23afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 10488 bytes

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