Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a52bedefd7c021…

MALICIOUS

PDF

46.3 KB Created: 2020-09-01 01:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 675b79f4b7e5f79d66468e9aa56eca09 SHA-1: f010af351ba942d206eb7477ba7813ec27c1e44a SHA-256: 83a52bedefd7c02167e749e0757808285c97544a06c30b471be07cb09ae9202d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, includes the same URL, suggesting an attempt to trick the user into visiting a malicious site. The presence of numerous other links to benign Shopify PDFs indicates a potential link farm or SEO poisoning tactic to mask the malicious URL.

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=affidavit+of+loss+format+license
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8379/2545/files/discord_join_messages.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4711/files/catalogue_oriflame_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/41177047113.pdf
    • https://static.usrfiles.com/ugd/d1d005_5c3d75afe73d4feb9cc1c98c3605469b.pdf
    • https://static.usrfiles.com/ugd/362633_5e9b8ce5e1644fc09f9c37a59652b6ee.pdf
    • https://cdn.shopify.com/s/files/1/0439/8150/4670/files/mawiwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1153/8072/files/tawig.pdf
    • https://cdn.shopify.com/s/files/1/0434/4050/4999/files/allama_iqbal_open_university_books_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0285/3538/files/80700874563.pdf
    • https://cdn.shopify.com/s/files/1/0431/0568/1557/files/52859604366.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2743/files/japetuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7475/files/xikakujirugo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8202/8958/files/21276740219.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_off00007659.bin
f152bcacd96f6e1d06b5e213801b9dfad883e5689470c57fbb8f51293bf81c6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7659 5216 bytes
font_01_sfnt_off0000880e.bin
1aa24e4411d5627ca7a19ad4326d89e71ff368180f049b0a7e1161ce0b3e4c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x880E 10192 bytes