Malicious PDF — malware analysis report

Static analysis result for SHA-256 26aefd9dc05657e6…

MALICIOUS

PDF

45.2 KB Created: 2020-08-30 21:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 326bfe9ddc809a6bba16244970adfa7b SHA-1: 81869f40ac84570ef73d588df715664f62decd59 SHA-256: 26aefd9dc05657e6d2cf98b9f736851c0789b22f12793220213ac2f1b8034505
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a link to a known malicious redirector, ttraff.com, disguised as 'Pocket books submission guidelines'. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or redirection attack. The document body, though heavily obfuscated, contains the lure text and the malicious URL. The presence of numerous Shopify links, while marked as benign, likely serves to obscure the malicious redirector within a larger link farm.

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=pocket+books+submission+guidelines
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/48853916913.pdf
    • https://cdn.shopify.com/s/files/1/0439/3274/5896/files/28378362970.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/dozuxepuvo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/58981366812.pdf
    • https://cdn.shopify.com/s/files/1/0430/2258/1923/files/73378264332.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/34900971084.pdf
    • https://cdn.shopify.com/s/files/1/0454/6166/7992/files/70540360105.pdf
    • https://cdn.shopify.com/s/files/1/0429/0120/9251/files/95058298421.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/forijofilile.pdf
    • https://cdn.shopify.com/s/files/1/0457/9187/1132/files/kapijezuzijadivetunep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/area_of_shapes_test.pdf
    • https://cdn.shopify.com/s/files/1/0470/6828/3048/files/in_line_19_inertness_most_nearly_mea.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_off0000727a.bin
2e27c99cad896736daf6d7bab7c0595b96ad43050bc44ec2b10dd7f6a9540b66
pdf-font-stream PDF embedded font (sfnt) at offset 0x727A 5160 bytes
font_01_sfnt_off000083f2.bin
a9b78e5be4e01bfa63ed4d016ff7db536dbaf4402d2720f3e227b8f5cbedfc26
pdf-font-stream PDF embedded font (sfnt) at offset 0x83F2 10772 bytes