Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa79215ba99b9e8…

MALICIOUS

PDF

42.2 KB Created: 2020-08-17 15:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d750e9977a87c22d8b68f4822a43b956 SHA-1: b9a1b1972962c27322e4c2daafa76feda954ea1a SHA-256: 3aa79215ba99b9e8e0fc81c2a6f5498c9c2f79c95ef557d236bf9c83b0e39e89
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination. The document body and embedded links suggest a lure to a 'local calling guide Australia', but the primary function appears to be redirecting users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=local+calling+guide+australia
    • http://files.olfoothills.com/uploads/1/3/0/8/130813317/denosazadipupe_tefuxo.pdf
    • http://files.allydoesmakeup.com/uploads/1/3/1/3/131379439/putuvudijomatewilag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/94333460206.pdf
    • https://cdn.shopify.com/s/files/1/0433/9843/0876/files/retinopatia_diabetica_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/gikavodoletaluw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4516/7008/files/510889118.pdf
    • https://cdn.shopify.com/s/files/1/0435/7046/2883/files/fubefubamadagawujel.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4703/files/rufufebexazatisa.pdf
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/chemistry_in_context_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2501/files/naburexezabijikak.pdf
    • https://cdn.shopify.com/s/files/1/0434/6596/5718/files/99753800299.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/xajorefumepuxiduru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/95388222923.pdf
    • https://cdn.shopify.com/s/files/1/0427/8566/9279/files/canon_lide_300_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0428/0441/2583/files/74805303048.pdf
    • https://cdn.shopify.com/s/files/1/0449/2718/9147/files/marketing_strategy_thesis.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_off00006867.bin
82c6b50472d2d80fa233e7602a47991ca3fe01fd1620273fbeb8553d64e66935
pdf-font-stream PDF embedded font (sfnt) at offset 0x6867 5048 bytes
font_01_sfnt_off00007994.bin
ada319d6705ed50c4f7fc6ee0002e0ee331004e6097751a71f9538a3d10480ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7994 10076 bytes