Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cfbc98f4eebe4c…

MALICIOUS

PDF

33.2 KB Created: 2020-08-25 00:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11ef0453c4eb10f5fdccb924f316dce4 SHA-1: 9ebced4e89ec68f6addcb5a0cf81a55f7a08e39b SHA-256: b7cfbc98f4eebe4ccbbc7a453f38789eae03a7159cade60e1b8baa85ec026297
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify-hosted PDFs. The document body, though heavily obfuscated, contains the primary malicious URL and several other URLs that are likely part of the distribution infrastructure. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=goodman+fielder+fiji+annual+report
    • http://tijig.bridges2learning.net/uploads/1/3/1/8/131871991/zapeto_loxaz_bixak.pdf
    • http://zuzebiluf.chrispickettceramics.com/uploads/1/3/1/6/131607600/daremotawevamameno.pdf
    • http://files.fpcfranklinpa.org/uploads/1/3/0/7/130739621/0349d6042ce3fba.pdf
    • http://files.collageofwomenartists.com/uploads/1/3/1/8/131871586/zorivom.pdf
    • http://sivoruw.laurawanamakerdoulas.com/uploads/1/3/1/6/131606122/mutapofo.pdf
    • https://cdn.shopify.com/s/files/1/0450/8496/7077/files/30360910474.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/44924784941.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/60427605623.pdf
    • https://cdn.shopify.com/s/files/1/0430/3853/9927/files/56949317401.pdf
    • https://cdn.shopify.com/s/files/1/0430/3290/3829/files/sezopezusexaxirisavoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17673355306.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5517/files/lijuxawawemivadupaju.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/bujokepedurulofone.pdf
    • https://cdn.shopify.com/s/files/1/0432/3537/7307/files/garijelagironugejem.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/33562128732.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_off000044ed.bin
2514516175875126d5445aee6cd48b744741b562a0780c3972ac061f864e5af1
pdf-font-stream PDF embedded font (sfnt) at offset 0x44ED 5116 bytes
font_01_sfnt_off00005649.bin
d7a7241551d9f2e5a6c5941ee9306d183d11674aac87a27d5261b3f532cc8c5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5649 9420 bytes