Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d53e1027d48cccd…

MALICIOUS

PDF

46.8 KB Created: 2020-08-11 18:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7423b81545d5845b3ad0ef7dc5012f2 SHA-1: 9b134f50bc5ad1f722e49c9da96f3767517258d1 SHA-256: 2d53e1027d48cccd8abfa230599724f44323f1474b650cbe9aeb0ac103917c6c
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to a redirector URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This URL is presented within the document body, disguised as a medical textbook title. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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=case+files+emergency+medicine+5th+edition+pdf
    • http://files.kaysit.com/uploads/1/3/0/8/130874338/nosule.pdf
    • http://files.queeninandblingin.com/uploads/1/3/0/7/130775109/9233597.pdf
    • http://files.surfacesolutionsnmore.com/uploads/1/3/1/4/131453539/dixidigetama.pdf
    • http://zofun.kumquatcoffee.com/uploads/1/3/0/8/130814328/5231571.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0435/0204/3288/files/catena_aurea.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/brachiaria_brizantha_mg4.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/80189912916.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/belagajaboxisesowowawisu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7414/files/apprendre_japonais_mp3_nhk_world.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80463449019.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/44117817545.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/tigulelumilewuve.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/92723684381.pdf
    • https://cdn.shopify.com/s/files/1/0429/0461/7119/files/97187482088.pdf
    • https://cdn.shopify.com/s/files/1/0434/0052/8033/files/fatoxaniriwu.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_off000066c1.bin
cc90c79c64b3a01d8aa8530b688c572e363a30a42859d4255ec20da47c7bec48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C1 1660 bytes
font_01_sfnt_off00006f04.bin
57dd6be851db57ef6bc0c0747080a8bc745753951e3f1fa2c1b23a05af1775a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F04 5700 bytes
font_02_sfnt_off0000823d.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823D 1800 bytes
font_03_sfnt_off00008acb.bin
2e7919bcf06ca30d8b783347f6518c62a7eca5c60b2133c5d096fc5849c8fd72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACB 10020 bytes

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