Malicious PDF — malware analysis report

Static analysis result for SHA-256 151378a7c01fa53b…

MALICIOUS

PDF

42.3 KB Created: 2020-08-04 10:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73c596f414e5bceb370893ef7b5f9f53 SHA-1: b034ac298570ec996c363c1bee72dec9dfd5931f SHA-256: 151378a7c01fa53bb8a8b0962f11f44720a8160bac1a31856893bfceae05b3f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=application+letter+for+loan+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure. The presence of many Shopify links indicates a potential link farm used for SEO poisoning or to host 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.com/pify?keyword=application+letter+for+loan+pdf
    • http://files.koepsellsfestivalpopcorn.com/uploads/1/3/0/7/130775109/bubuserinebisetu.pdf
    • http://files.compassionchristian.men/uploads/1/3/1/4/131437363/8c19ba0989b48.pdf
    • http://files.steveweave.com/uploads/1/3/1/6/131637631/kosubofuxowiwew_sovisobetima_nuzejaju.pdf
    • http://files.erni.edu.pl/uploads/1/3/1/3/131380889/wuxinedisolox.pdf
    • http://files.ericamesser.com/uploads/1/3/1/3/131378975/a85f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42632515291.pdf
    • https://cdn.shopify.com/s/files/1/0432/6545/8342/files/burn._avi_to_dvd.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/bosovufenafakodewubalapu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6743/files/56724414193.pdf
    • https://cdn.shopify.com/s/files/1/0432/3278/8648/files/html_codes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/1394222017.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/43799780042.pdf
    • https://cdn.shopify.com/s/files/1/0433/7208/5406/files/73029091502.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/59843315736.pdf
    • https://cdn.shopify.com/s/files/1/0437/7965/3789/files/players_handbook_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/zezuri.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/403_forbidden_nginx_1._0._15.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/pivelugoxagafinew.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_off0000697a.bin
822d94375b2061642dd44025f535494b2d58b17ee418472211bc646d692269bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697A 4960 bytes
font_01_sfnt_off00007a6c.bin
090c1ea30774a34587a7e91c50d4f25471ff3aac25aca9556adcf74e23e334ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6C 10020 bytes

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