Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d20b1191b04dc2…

MALICIOUS

PDF

44.1 KB Created: 2020-08-01 18:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52d7252b049e1b0ae6db31e559f4c89f SHA-1: 5da93693e5e99385a6d5076c54ce71a0501f177d SHA-256: 13d20b1191b04dc261b853a49ab523eafff1e42439f175218dd2dde1a660848d
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link redirects to a malicious infrastructure at 'ttraff.com', likely serving as a lure for users seeking 'free quickbooks training manual'. The ML classifier strongly indicated maliciousness, and the PDF structure itself suggests an attempt to host or distribute numerous other PDF files.

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=free+quickbooks+training+manual
    • http://files.nourishthefire.com/uploads/1/3/1/4/131410736/vavilosake.pdf
    • http://files.hrmis.es/uploads/1/3/0/7/130775249/mujobedejexakodabux.pdf
    • http://files.belmardemocrats.org/uploads/1/3/0/7/130776228/795741cad6266.pdf
    • http://files.jerniganlandscaping.com/uploads/1/3/0/7/130740517/61526a051.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2670/1726/files/39664515323.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/jovivud.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/51093519451.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/63960524232.pdf
    • https://cdn.shopify.com/s/files/1/0432/3973/5464/files/23770498354.pdf
    • https://cdn.shopify.com/s/files/1/0436/9504/6824/files/lakedowijomebob.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9127/files/forerupinuwebiwopuro.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/bodorule.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/putikusumidiveze.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9242/files/gubutetazokirorile.pdf
    • https://cdn.shopify.com/s/files/1/0431/6030/5825/files/jitajobibo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1595/4847/files/vebaxajusafunimoxegetal.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1944/files/90221158709.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/tivivirorodezijef.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_off00006e14.bin
7cfcd21d2b9533e80add391933756b2f20125a00c4f29bf6772dea1926cd154c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E14 5404 bytes
font_01_sfnt_off0000806c.bin
04a2cfc0eadc6bdae9b822eee36d1aa2be569a13370834b74f6b81e7683a332f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806C 10320 bytes

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