Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad99209140bb405b…

MALICIOUS

PDF

38.9 KB Created: 2020-08-22 09:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 99c41b8a075eaf106c81b60e786a7517 SHA-1: 68f9791f80ac0fffc280350b2566b139d17f932c SHA-256: ad99209140bb405b754901d24231c1c95433bf00683690049d78c8202656b24e
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.ru. This URL is embedded within the document body, disguised as a search result for an academic PDF. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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=abnormal+psychology+an+integrative+approach+pdf In PDF document text
    • http://files.pantaipetroleum.com/uploads/1/3/0/8/130814402/vulef_wutiz.pdfIn PDF document text
    • http://fijava.shorelinehicap.org/uploads/1/3/0/9/130969762/lizizasekobozore.pdfIn PDF document text
    • http://kuwojifo.thewhistlepunk.com/uploads/1/3/2/3/132302936/9779466.pdfIn PDF document text
    • http://files.dididothat.net/uploads/1/3/0/7/130739742/bulevusenagewelug.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/1/0460/6240/3739/files/paxawikebowojuxadilojez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/sexubezagamajekiketorukaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7185/5002/files/20747223883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31492874922.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0774/5958/files/calpers_ltcg_forms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/bozaxebutokerizov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/72512375059.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/femaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/low_cholesterol_diet_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1451/9966/files/english_verbs_with_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3623/7206/files/25699304445.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/gobitabapeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8851/9076/files/53337547701.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 5

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_off00005641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5641 5860 bytes
SHA-256: af763fbe192c30261e4780e8faf3d29e0ac397532604d4efc2c007729e20fea7
font_01_sfnt_off000069f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F9 10640 bytes
SHA-256: fa16a7983d8fdc7811f357fb8fa77939067934f74371a7e978fb9de68f18bd46

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