Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b9a6b14f903a96…

MALICIOUS

PDF

33.6 KB Created: 2020-08-22 15:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5328409513a62419d53a6d4cf0b4d96f SHA-1: 1c85b8ffd6ac49548c9bcfc193441387faaa246c SHA-256: 10b9a6b14f903a9676905cb7300ba009ccb062bebb706a1d771d9c4a424fec6d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a link farm, and one specifically to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=ansul+442r+installation+manual', suggesting a lure to trick users into visiting malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=ansul+442r+installation+manual
    • http://files.nlfarchitect.com/uploads/1/3/1/1/131163620/4192135.pdf
    • http://putasuwur.drgarygoodman.com/uploads/1/3/2/6/132681946/3510140.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0215/7466/files/73785213690.pdf
    • https://cdn.shopify.com/s/files/1/0429/6025/7177/files/noxolazelin.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/62816284665.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/xazuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/2670/9665/files/13353154871.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zutowujovepenatugipo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6539/3820/files/53588344866.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/16564227488.pdf
    • https://cdn.shopify.com/s/files/1/0434/0593/4759/files/wwww._dropbox_connect.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/namo_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/vigepuropuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4865/files/12732111755.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_off000046f8.bin
1f650b03a323824991149cd60d1f7d5201f29178b77d13cdcb784ef9d373e724
pdf-font-stream PDF embedded font (sfnt) at offset 0x46F8 5040 bytes
font_01_sfnt_off00005801.bin
f6b815cc408c0b96b2b8665e74aa6210e7235ad2828f581e4bdc7bcef164d46b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5801 9924 bytes