Malicious PDF — malware analysis report

Static analysis result for SHA-256 b630dfd01e0c7285…

MALICIOUS

PDF

59.2 KB Created: 2020-07-31 13:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eae55ea71b50e2ff7509a5687d193326 SHA-1: 2070969f9847e5be087f8d1b1e7f215f73562258 SHA-256: b630dfd01e0c72852d6fbce7ad7843554145cc0b1b79d1eb9ca87e4e1e948115
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a malicious redirector link that is disguised as interview questions. The link leads to 'ttraff.cc', which is known malicious infrastructure. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm for SEO poisoning. The ML classifier strongly flagged this PDF as malicious.

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=back+office+manager+interview+questions+and+answers+pdf
    • http://files.barrons-conferences.com/uploads/1/3/1/4/131409170/3066792.pdf
    • http://files.thewaveindustries.com/uploads/1/3/1/4/131413837/a1b902b2.pdf
    • http://files.gerrygillespie.net/uploads/1/3/2/3/132302992/263946.pdf
    • http://files.gerrygillespie.net/uploads/1/3/2/3/13230
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/vopivat.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/naropa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9107/files/sejidemibatawud.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2519/files/bofavogi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/kujewab.pdf
    • https://cdn.shopify.com/s/files/1/0432/9970/0889/files/fepezirixibuki.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/38712280823.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6721/files/sepitaragugusotiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zamujogeve.pdf
    • https://cdn.shopify.com/s/files/1/0436/3563/8425/files/11301363621.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/varudorinupuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2347/files/60956685529.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sesolofulazige.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/35193392354.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/koxogosaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008772.bin
b8b499299989ae4e7575117e7482c18589104f286151657e3ecc363f60229275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8772 5716 bytes
font_01_sfnt_off00009ad3.bin
a0e67e6cda0e5dbcebfe82fb95abf6330ac7de70c85b3c681b16a54690e4e2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD3 1924 bytes
font_02_sfnt_off0000a40c.bin
4cc621472b9685a83c9466bed39d5fc8de7833a318d0b5b3cc5c1e54686511a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA40C 10404 bytes
font_03_sfnt_off0000c785.bin
f68e4b4d42456b360743c7acf69c82a49aa063f25f521dd5c66d8c69e3fa217a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 16436 bytes

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