Malicious PDF — malware analysis report

Static analysis result for SHA-256 6448918fa71cfb32…

MALICIOUS

PDF

47.9 KB Created: 2020-08-01 04:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b97fb978f3a841e7106e7d6c0fde7799 SHA-1: 6de2961a1df14b8e1c4c055d695e1fafde13043e SHA-256: 6448918fa71cfb32630b36cfe07b1864986db5fe027c3dd81855a7a9a5c631da
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious content. The document also hosts a large number of links to other PDFs, suggesting a link farm or a method to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a callback lure heuristic suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=an%252F+vrc-+90f
    • http://files.ihsanedu.com/uploads/1/3/2/6/132681488/tomibakegovaloji.pdf
    • http://files.charmchi.co/uploads/1/3/0/7/130739011/767677.pdf
    • http://files.roxburyvfd.org/uploads/1/3/1/1/131164023/a81b7.pdf
    • http://files.northern-islander.com/uploads/1/3/0/7/130739012/1ba89b2f7abc0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/budevurugoluzuzawizejoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29883534071.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/dodowofodaduwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4871/files/kojesiviweziwadolaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/zadabofufafinis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/57043239089.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/12860760535.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2652/files/jugijimesurafukudepudik.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1319/files/16085706092.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/45443465963.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_off00007e17.bin
0d25cb2c50d771a28cab5ac54bf767a390fd123e30a6d9fee622f1970769754a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E17 4872 bytes
font_01_sfnt_off00008edd.bin
6480608dcc596529e5b258bf5af5ad169bb85c217a76d7599e0d247a8c5c3fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDD 10644 bytes

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