Malicious PDF — malware analysis report

Static analysis result for SHA-256 b107bf8469115067…

MALICIOUS

PDF

53.2 KB Created: 2020-09-01 16:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28020d07080860197c211513da7c2a63 SHA-1: 4431d8f3ab94452afbca67ecc6d197a6762906da SHA-256: b107bf8469115067ac7dbeaf9ddc3d295fb0dfd9bba9fe27efe2492a22e3c09f
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, forming a link farm. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily garbled, contains the text 'blackmart latest version apkuncle' and the redirector URL, suggesting a lure related to software downloads. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the link farm and redirector indicate a likely distribution or redirection mechanism.

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/wix?keyword=blackmart+latest+version++apkuncle
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/monegudifezunulafofev.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/wutudogimojubomedowumix.pdf
    • https://cdn.shopify.com/s/files/1/0435/6558/0449/files/52214260416.pdf
    • https://cdn.shopify.com/s/files/1/0451/7930/6135/files/18108940937.pdf
    • https://cdn.shopify.com/s/files/1/0438/7389/4555/files/definition_of_tumblr.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/89589827897.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/gubupuvipavafe.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/kakezosesepaxebagima.pdf
    • https://static.usrfiles.com/ugd/405339_df40eea012ca4e5e823cfbb50c4f459c.pdf
    • https://static.usrfiles.com/ugd/d775a9_5d5a4c6e69de4ffbb5ac17f228a0f813.pdf
    • https://static.usrfiles.com/ugd/90423f_a12e3ae96f024b56b55c4f15873b5f68.pdf
    • https://static.usrfiles.com/ugd/4b68be_f93049a2fed6410ca88f74c9080353e0.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074c4.bin
952bd287f9c9847d7ca179f7698c8f9ca576be0216c1a75e58a42cc52b6a3720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C4 5252 bytes
font_01_sfnt_off0000868c.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868C 1800 bytes
font_02_sfnt_off00008f1a.bin
abc05a1ec952ac10542ee1f3fddb1084595a6c059d1fb8e45da5d41cd36a5122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1A 10036 bytes
font_03_sfnt_off0000b190.bin
552e926f59ef53231249b6015cc51882b512f7a40c6b17c25f707dc25a221893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB190 16368 bytes

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