Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b081852b5e4a022…

MALICIOUS

PDF

36.3 KB Created: 2020-08-29 01:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc6b0b41aead4d82d12e32eddb715609 SHA-1: 5e45d802ae38bb20a12cdb6535ae3eee5fb4eae8 SHA-256: 8b081852b5e4a02238f8d954b80f3fc60bed209590b9c9881311ca6bdff58d6a
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, likely intended to deliver a payload or phish for credentials. The document body text, though heavily obfuscated, contains the same search query and URLs found in the heuristics, suggesting a lure for malicious content. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy to obscure the malicious redirector.

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/wix?keyword=unakkulle+mirugam+song+download
    • https://cdn.shopify.com/s/files/1/0431/4952/5149/files/anfis_toolbox_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2152/5407/files/1001_questions_mcat_biology.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/vegan_baby_food_guide.pdf
    • https://cdn.shopify.com/s/files/1/0441/0785/8072/files/labemimoxodalukewixepes.pdf
    • https://cdn.shopify.com/s/files/1/0447/8284/6109/files/que_es_accidente_de_trabajo.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1b405fb8ba84b7eadd8756f7b612aad.pdf
    • https://static.usrfiles.com/ugd/b8c837_55bf3f6d318a4a059be0e1e5e90bd68c.pdf
    • https://static.usrfiles.com/ugd/b8c837_98fd96e897cd4cdc8a5b05b1f5ad7974.pdf
    • https://static.usrfiles.com/ugd/b8c837_f00786febb774dfcb39f79a1bc40f0bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc9f49499aad4e9d969b7b51fc7e39d7.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/38852263665.pdf
    • https://cdn.shopify.com/s/files/1/0439/2199/7979/files/kebibovewatakelaxiza.pdf
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/deathwatch_rpg_core_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/rapofobetaxadiforil.pdf
    • https://static.usrfiles.com/ugd/b8c837_230e54ad78f74a5ca0fe52ef384afac6.pdf
    • https://static.usrfiles.com/ugd/b8c837_7abbe3ac97e94446a9a8ad4482f93da4.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a21550afb224f0e8007d37ec4b9f7d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a694811ad564bd38b965194c57d12a1.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_off00004e78.bin
e395b9e82157a9f760e67a17f79d5ce666da81f7335c9dc78ae26f10244b11ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E78 5292 bytes
font_01_sfnt_off00006071.bin
f470cdb7d142b727075a101ebdafa01b4a6f9bad638f1aba4343f13cd3a77088		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6071 10584 bytes

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