Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c938684faa2c81a…

MALICIOUS

PDF

51.6 KB Created: 2020-07-24 16:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 48ffaac483b3bd4b2b28fa0fccf9acfc SHA-1: 6c461f7b17e2e8312c759a5031a1dc00eb74dbe3 SHA-256: 5c938684faa2c81a0344c66c75b41b3d148add6305bf4bd67772de2ca132f127
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to 'instrumentation engineer interview questions and answers'. The presence of multiple PDF links and a redirector indicates an attempt to drive traffic to external, potentially malicious, resources, likely for phishing or malware distribution.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.ru/pify?keyword=instrumentation+engineer+interview+questions+and+answers In PDF document text
    • http://files.njsaferatios.com/uploads/1/3/1/8/131856435/jovupufotonidowun.pdfIn PDF document text
    • http://files.portaldrivertraining.com/uploads/1/3/2/6/132695568/9326625.pdfIn PDF document text
    • http://files.ppgaacaernarfon.org/uploads/1/3/0/7/130775413/gonavaxiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/zutexaxuzezasomo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/zapapiwuvuvurusinis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7792/5019/files/sitenido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/kanotanedanajamibaput.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3756/4823/files/xozewonodorukisutarolefut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/41617638611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16779745642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85286147205.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/maxuzojimike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/jujefanosafuji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/difuxek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/52929841292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/50558217757.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFC 5212 bytes
SHA-256: 9fa9ecdcfc78c6d454d77d0658670ca800e93f1bad6403d98a135be7a1aadb0d
font_01_sfnt_off00009d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D9B 10228 bytes
SHA-256: afb739d7672a12b2814e5fc18f33106ce9bfe371030fdca2442a286c68dfa018

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