Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed1fced767f70b2…

MALICIOUS

PDF

46.6 KB Created: 2020-08-16 19:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3217af7a3f6eeb8b27a01509d2daa0f6 SHA-1: 08ea8de1f3cf29cf7a3db191175d1440e3b5c053 SHA-256: 7ed1fced767f70b21b7cf01e1aaf04a907654312c2aa546421adf0936542446e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=arbeitszeugnis+schlussformel+ohne+bedauern'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains the same malicious URL, suggesting an attempt to lure users to a potentially harmful site.

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.cc/pify?keyword=arbeitszeugnis+schlussformel+ohne+bedauern
    • http://punevotuf.drgobleconsulting.com/uploads/1/3/0/7/130775506/bisexox.pdf
    • http://gufekowob.missladytweet.com/uploads/1/3/2/7/132740880/7757184.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0430/1871/5289/files/rusutiganiwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/31547938901.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/5852097828.pdf
    • https://cdn.shopify.com/s/files/1/0439/3782/4926/files/finotipobewota.pdf
    • https://cdn.shopify.com/s/files/1/0428/7502/7619/files/lesosemikebanasexon.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/17684956594.pdf
    • https://cdn.shopify.com/s/files/1/0438/6347/4331/files/latest_periodic_table_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/53510091512.pdf
    • https://cdn.shopify.com/s/files/1/0429/1375/9395/files/buremujepesavukewajid.pdf
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/risewurokifomivexolaxexa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/88551042665.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000678a.bin
ca3a3d8b702f8b3ca3ffd57c9d88f10985be23bb2eddb73790afa0885dd9122c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678A 5496 bytes
font_01_sfnt_off00007a00.bin
9505ba243b9fa3ad0d405feb40826844461219f18a5d3d87b8d7dc675ddf9ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A00 10816 bytes
font_02_sfnt_off00009d9c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D9C 4324 bytes

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