Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c35d14809e01b0…

MALICIOUS

PDF

44.9 KB Created: 2020-08-02 07:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b7114af08df67e56fb3874c60549e43 SHA-1: 1d2f0420dee8a6b39b23556fbb14968734ae5be5 SHA-256: e7c35d14809e01b0dc28530cc3c590d56835a0edfc9087287207b80b78a81aeb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. Another critical heuristic indicates a PDF link farm, with many links pointing to external PDFs hosted on domains like cdn.shopify.com and other unknown domains. The document body, though heavily corrupted, contains the URL https://ttraff.com/pify?keyword=indiana+cities+by+population, reinforcing the malicious redirector finding. The primary attack pattern appears to be the distribution of malicious content or SEO manipulation through a large number of external links.

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=indiana+cities+by+population
    • http://files.sloreunion1969.com/uploads/1/3/1/3/131384414/1819949.pdf
    • http://files.airoilandlead.com/uploads/1/3/1/8/131856285/7692927.pdf
    • http://files.scatteredsacred.com/uploads/1/3/2/6/132695351/7dfb983c8e70.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3970/files/13945302150.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/97485675942.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/jiboj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3046/files/niridegodezilepuxozusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/ruforobivitopapufigewaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/80903376534.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/88296958757.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/79828118084.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/why_did_macbeth_kill_banquo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/kaxexegepa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0359/9272/files/jawitinox.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_off0000722d.bin
42ea5ad548fc8e9432b633a00307c36a113bdfe0ff111f619e5979e0656c2b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722D 5152 bytes
font_01_sfnt_off000083c5.bin
32f6c18c56798062ef41f1de2bffae73d5449ba65a0034e575c3a1905a1a5d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C5 10412 bytes

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