Malicious PDF — malware analysis report

Static analysis result for SHA-256 40abc19c78aa3ca0…

MALICIOUS

PDF

41.3 KB Created: 2020-08-04 13:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 191b2caaced13c6bb554c774eb522158 SHA-1: d90e1437b0a494ad9b3cae010c01810b6dc2cfe4 SHA-256: 40abc19c78aa3ca0e526891fcd39b98f7d6f6227b328be0c63bae7aa3fb87da9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary link, https://ttraff.com/pify?keyword=birds+pictures+for+colouring+pdf, is designed to lure users by appearing to offer coloring pages. This link is part of a larger link farm, indicating a coordinated effort to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=birds+pictures+for+colouring+pdf
    • http://files.lplimages.com/uploads/1/3/1/4/131452903/tekibuxezavo-fowudo-domejos.pdf
    • http://files.fauncechurch.com/uploads/1/3/0/7/130740571/1db84a22.pdf
    • http://xesogi.northeastrandolphpropertyowners.com/uploads/1/3/2/3/132302780/8662199.pdf
    • http://xeket.danpetersundland.com/uploads/1/3/2/6/132695306/gejos.pdf
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/17539722308.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/20433633831.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/nawufidoti.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/77274063737.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/96079480860.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/dotiwafurezivasepi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/kugolawufikexovunuvofetoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/5849/3600/files/background_of_the_study_sample_research_proposal.pdf
    • https://cdn.shopify.com/s/files/1/0433/1480/6937/files/katatavovatubujizewitup.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/26016006661.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_off000065ec.bin
4739e8aa7aac7bcf08f86a429289d8afd2f41e88530af64531ae46cac709af3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x65EC 5164 bytes
font_01_sfnt_off00007790.bin
646a8dcb09e8fa1fdc71dde20608c4c475af835552348a3614a388be0cc8466c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7790 9664 bytes