Malicious PDF — malware analysis report

Static analysis result for SHA-256 0675f50645cdd5e1…

MALICIOUS

PDF

41.7 KB Created: 2020-08-03 03:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6336503333beadc1666a9b78ede838e0 SHA-1: 52d82c618d100ca7e73f30160160d98baf879788 SHA-256: 0675f50645cdd5e123359eaaa5893a2d773876c08fb27a87785142cb0dbc0265
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.ru/pify?keyword=the+bfg+lesson+plans+pdf'. The document body, though heavily obfuscated, contains text suggesting a lure related to 'lesson plans'. The presence of a large number of external PDF links, many with numeric slugs, indicates a link farm designed to attract traffic. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=the+bfg+lesson+plans+pdf
    • http://files.tedxarnhem.com/uploads/1/3/2/3/132303172/3146e35.pdf
    • http://files.chromechasersflyfishing.com/uploads/1/3/1/8/131858791/6178122.pdf
    • http://files.alstrangeways.com/uploads/1/3/1/3/131379894/gipopokufi.pdf
    • http://files.southbyland.com/uploads/1/3/1/6/131636655/c96c044bcfb5df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/22583490271.pdf
    • https://cdn.shopify.com/s/files/1/0437/1152/9114/files/goxoseripobenej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/vokufaposuwukemorinitu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/17776671328.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3527/files/jevazukukusarusut.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/damuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/28156436641.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/10835454516.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4566/files/94789811530.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2507/files/ruxomuwemifafiworo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/57673500941.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/kobowefesexelijamobe.pdf
    • https://cdn.shopify.com/s/files/1/0436/2610/2947/files/76437919409.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_off00006528.bin
4b1aa9df192ff7032fc6ff55a429d31ae2062572c15e1840abcd5a12717234bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 5296 bytes
font_01_sfnt_off00007728.bin
3d3f0a3b231f0414d7f3235a5a200d49abdba1dad80ed6b1883185a7e7f7726f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7728 10240 bytes

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