Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff0db4f729afabb…

MALICIOUS

PDF

50.3 KB Created: 2020-07-24 17:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa5fea9991156246fa06e4f52c2e7878 SHA-1: 317fd04b0c289900638ea412aa55e62fe7d0f415 SHA-256: cff0db4f729afabba7b3d98cc46d3662e09c9bc0e642bebd22d921b9b03a3923
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links. One of these links, 'https://ttraff.ru/pify?keyword=anabolic+fasting+guidelines', points to known malicious redirector infrastructure. The PDF also exhibits characteristics of a link farm, with many URLs pointing to external PDF files hosted on Shopify. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of its specific lure.

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.ru/pify?keyword=anabolic+fasting+guidelines
    • http://files.granitestatehydro.org/uploads/1/3/1/3/131379506/8b9687775a01.pdf
    • http://files.seejillteach.com/uploads/1/3/2/7/132740880/guxikedibupej.pdf
    • http://files.jennymills.co.uk/uploads/1/3/1/4/131407635/5335026.pdf
    • https://cdn.shopify.c
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/busesesurezuzaxok.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/84555460405.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/75530790931.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/70461808377.pdf
    • https://cdn.shopify.com/s/files/1/0435/3038/7607/files/jazodoxudizupuduzaruxeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/52494059245.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8276/files/55792808269.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/wususobavefo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/xiboligopodonusemafo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/34827938213.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/29716570954.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/34296377482.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/winofu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c08.bin
4357865877a1cace4e9b4a1d4cc7bf2588959077b9b73245e93c37892adde396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C08 5104 bytes
font_01_sfnt_off00007d70.bin
26602a31c1b42162ba5968a524e3fc667796eee52b93ffd4253e9c8184333e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D70 12836 bytes
font_02_sfnt_off0000a69b.bin
6bd38090ed777df9b92677ea85131394f31f8e693e2fa156965331ed3544f37d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA69B 16140 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.