Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44e62539efccf8e…

MALICIOUS

PDF

42.4 KB Created: 2020-08-24 20:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc6f16301f83e29e0b1287669f56bbc1 SHA-1: 4590a856e493a57f15d1782216bbe796fe242983 SHA-256: d44e62539efccf8e28384bfee960142f135da7d3a1f362bcbd34f9dccdee9ee2
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains multiple heuristics indicating malicious intent. Specifically, it includes a critical PDF_MALICIOUS_REDIRECTOR_LINK firing, pointing to a URL that is part of a known malicious redirector infrastructure. Additionally, a PDF_SEO_LINK_FARM heuristic indicates the document is part of a link farm, with many embedded URLs pointing to external PDFs. The document body contains the primary malicious URL and several benign-looking URLs, likely part of the link farm. The primary malicious URL is https://ttraff.cc/pify?keyword=housewarming+party+invitation+card+format, which is designed to redirect users to further malicious content.

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=housewarming+party+invitation+card+format
    • http://jinigi.andovertheatre.org/uploads/1/3/0/8/130874683/4725908.pdf
    • http://files.spinecarechiropractic.net/uploads/1/3/1/3/131384018/30437.pdf
    • http://files.tandem-co.com/uploads/1/3/1/8/131859895/fopanuxaduz_bebika.pdf
    • http://files.daisytowers.com/uploads/1/3/0/7/130775299/napudajavijesi-tafatot.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/new_moon_graphic_novel.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/5279718709.pdf
    • https://cdn.shopify.com/s/files/1/0431/6951/3632/files/12159745890.pdf
    • https://cdn.shopify.com/s/files/1/0433/2866/7816/files/apache_web_server_2._4_for_linux.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6042/files/34759357114.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/pink_formal_dress_wedding_guest.pdf
    • https://cdn.shopify.com/s/files/1/0431/0712/3357/files/31945241418.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/bts_love_yourself_answer_seesaw_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/6821/8780/files/cisco_ccna_practice_labs.pdf
    • https://cdn.shopify.com/s/files/1/0433/9453/1486/files/18499560911.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9517/files/15221074518.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_off0000667e.bin
d85396edc658a4d9b2d6f32c2136327b6cacfdfc39b16040719f9883ac3dae7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667E 5660 bytes
font_01_sfnt_off000079c5.bin
f190796ee458dfc77a8ea87459964e479d5a2dce664e338c46ac609d52270fbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C5 10120 bytes

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