Malicious PDF — malware analysis report

Static analysis result for SHA-256 4177161bca6e7f1b…

MALICIOUS

PDF

69.6 KB Created: 2020-08-03 01:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f009c264a4d04c04d6145f4255951423 SHA-1: e33c195913137737bffcbb86aaf71c8bd02d58ec SHA-256: 4177161bca6e7f1b28e451654264f4dd4e7427f6ea3eb352af95d6ea7eab55f0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=fire+red+victory+road'. This URL is likely used to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL.

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=fire+red+victory+road
    • http://files.travelinkcard.com/uploads/1/3/1/0/131070591/2606120.pdf
    • http://files.otsegofitness.com/uploads/1/3/2/6/132695629/rafikewone_mefowagidozenop_malose_ledud.pdf
    • http://files.pristineyc.com/uploads/1/3/1/4/131438759/jokuwipiwixur.pdf
    • http://files.sparkyourrockstar.com/uploads/1/3/0/9/130969742/7383480.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0436/1895/9523/files/lifatunenaperewetalufimu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/ap_style_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/wavem.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2838/files/tepubetegudu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/77859598933.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/photoshop_heart_brushes.pdf
    • https://cdn.shopify.com/s/files/1/0437/4547/6762/files/21914834829.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/git_bash_prompt.pdf
    • https://cdn.shopify.com/s/files/1/0429/9892/3427/files/febazesokanenan.pdf
    • https://cdn.shopify.com/s/files/1/0433/5747/0872/files/lightning_salesforce.pdf
    • https://cdn.shopify.com/s/files/1/0434/8710/1094/files/vovateged.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_off0000d153.bin
d6ae1b4e0efa0c4ef320a2d3b019baa7a6f81fc9417835a4d1a248916beb499d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 4840 bytes
font_01_sfnt_off0000e1e9.bin
55cf8100ec24e7ed5b0acbf73afb859ee61a8677af882e2c32608373c2392634
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 11920 bytes