Malicious PDF — malware analysis report

Static analysis result for SHA-256 187bf29a854404eb…

MALICIOUS

PDF

42.3 KB Created: 2020-08-15 06:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03cf5862c10795a86f05247468e71636 SHA-1: 3740cc39cc389036be7ad7d6ec5e92f0d0399b14 SHA-256: 187bf29a854404eb7ee027219e813f19a31453619f72f4e419a32c3e9ebdc868
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a redirector service and then to other PDFs, suggesting a link farm or redirection scheme. The presence of a malicious redirector link and the ML classifier's high confidence indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=windows+7+ultimate+32+bit+free
    • http://gikonal.massillontigerinstructionalresources.com/uploads/1/3/1/3/131384284/2060991.pdf
    • http://files.byster.com/uploads/1/3/1/1/131163667/bezupetebibovami.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6156/5850/files/adj_dmx_operator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/zewozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/samavutawetunosurixuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4311/files/43874424030.pdf
    • https://cdn.shopify.com/s/files/1/0438/2208/8354/files/89972797438.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1599/files/hssc_clerk_answer_key_22_sep_2020_evening.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/taramisugena.pdf
    • https://cdn.shopify.com/s/files/1/0430/1750/2869/files/58168458678.pdf
    • https://cdn.shopify.com/s/files/1/0438/7710/5832/files/goxefujuno.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/byculla_to_bangkok_free_download.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_off00006677.bin
811e15b49e6255e593cfb66d2f8c3f59c8cd180ea20d5fb14520e6110ba006fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6677 5676 bytes
font_01_sfnt_off000079cf.bin
8d39f469ed1b4cb02c9f84079bd3364fc0bd904bc104199719acb28612b05606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CF 10148 bytes

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