Malicious PDF — malware analysis report

Static analysis result for SHA-256 824a8a5148e654fd…

MALICIOUS

PDF

53.6 KB Created: 2020-08-30 08:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d07a0689643f3b6a4fe9377b3f6b341 SHA-1: 753fab0a37a86d1a66a39e432123343d37a9d2fb SHA-256: 824a8a5148e654fd7c00e0640055652701107e87d57d9c27a8932f384e93ff49
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector service, which is flagged as malicious. The document body, though heavily obfuscated, contains text suggesting a lure for free MP3 downloads. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO manipulation tactic to mask 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.com/wix?keyword=reggie+p+why+me+free+mp3+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/409ca8_6e22237a5b1f46f398f23d1f972660b5.pdf
    • https://static.usrfiles.com/ugd/493135_77259df689464fbba45f074764496ebb.pdf
    • https://static.usrfiles.com/ugd/73cb9e_4e47ed7643ff4eda9e06bcc108572e5a.pdf
    • https://static.usrfiles.com/ugd/d3758e_fc6980d9066a4849bda69494c8701dd6.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3788/files/gogujanizalivabutozu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/50724844865.pdf
    • https://cdn.shopify.com/s/files/1/0434/5551/2738/files/catapult_king_mod_apk_unlimited.pdf
    • https://static.usrfiles.com/ugd/9e41f0_5a9ba60f97e04bb39b10882061d6b738.pdf
    • https://static.usrfiles.com/ugd/de65f7_31e235a3ea804d44b8d2893ffd057329.pdf
    • https://static.usrfiles.com/ugd/122077_1d21d7461b0d4b0a8c25802c4f832a87.pdf
    • https://static.usrfiles.com/ugd/de3d83_6df1e8a051634af9941a4b7f4d4d7760.pdf
    • https://static.usrfiles.com/ugd/fe83c3_88869e43ebb7490e8bdd2abc7b4d9465.pdf
    • https://static.usrfiles.com/ugd/a86d68_2efc88c144ab4906a317df38bf27cf3c.pdf
    • https://static.usrfiles.com/ugd/69b86f_4bc9e71def164cdbbd9b1016c7caf0c1.pdf
    • https://static.usrfiles.com/ugd/5360f8_516492cfc5334d4b8dd3ba8e11a524a5.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_off000091a5.bin
4959318fd439ebab4535bc9fc7708afc1d500b827204966310f8fcc8183b3893
pdf-font-stream PDF embedded font (sfnt) at offset 0x91A5 5644 bytes
font_01_sfnt_off0000a4dd.bin
ae227eb011bab4e369a547908e2f8753e9697d69d72fc2671ccebec595d781b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4DD 10696 bytes