Malicious PDF — malware analysis report

Static analysis result for SHA-256 a216658b131b1cdd…

MALICIOUS

PDF

39.1 KB Created: 2020-08-24 10:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5ad32424ed231f323f688e6f450c5d5 SHA-1: fb06b9659d93ed162e9817313942f27f994c0522 SHA-256: a216658b131b1cdd4b2e76a0976eb210c6fdcb0bddff0745ae4f81227be90cd5
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.com/pify?keyword=html+format+phone+number'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector URL is sufficient to classify the document's intent as malicious, likely for phishing or malware delivery.

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=html+format+phone+number
    • http://joxal.hofssi.com/uploads/1/3/0/8/130874655/93bac4e4ea79e.pdf
    • http://luxavos.texascottonginmuseum.org/uploads/1/3/1/6/131636648/1958547.pdf
    • http://files.lotusranch-homes.com/uploads/1/3/1/4/131406337/1f22c51541ac.pdf
    • http://files.paperballoon.org.uk/uploads/1/3/1/4/131453950/lugawe.pdf
    • http://dinuzob.caveofpixels.com/uploads/1/3/1/3/131383657/xiposawixim.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/36046589857.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/76877669723.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/nekotuvinoravufif.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/barmetro_de_las_amricas_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/basic_english_grammar_exam.pdf
    • https://cdn.shopify.com/s/files/1/0435/6472/8483/files/categories_game_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6041/files/37008783396.pdf
    • https://cdn.shopify.com/s/files/1/0450/5577/0776/files/solid_waste_management_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6335/2227/files/satavupub.pdf
    • https://cdn.shopify.com/s/files/1/0438/4469/8272/files/nokia_infinity_best_tool.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_off00005c76.bin
c97316476f27943559cc74991328da895e0e1a3187a86d2b0e34f12530d1e90d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C76 5064 bytes
font_01_sfnt_off00006d7d.bin
9574b5a46d77484577845dde7c2387004a90ea622d8f3c43f123d0050c6a6c17
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7D 10044 bytes