Malicious PDF — malware analysis report

Static analysis result for SHA-256 7376b88cd62a8f34…

MALICIOUS

PDF

40.1 KB Created: 2020-08-02 13:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5bf081d80b82bf8fe265eb2b813054a8 SHA-1: 3fdf43ac3c8571522d829add3a00631e3b8b0adf SHA-256: 7376b88cd62a8f34681debafbc0dceb0817025f70eb8deb51be13cc73c4c9d8c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.com) disguised as a free download for an 'ACS inorganic chemistry practice exam'. This indicates a phishing or scam attempt to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=acs+inorganic+chemistry+practice+exam+pdf In PDF document text
    • http://files.keyinmigration.com.au/uploads/1/3/2/6/132695513/senoxipa-vilegevujiko-kopofew-kepanigile.pdfIn PDF document text
    • http://files.lauraavnaim.com/uploads/1/3/0/9/130969819/0ec2ee5.pdfIn PDF document text
    • http://files.milanfirst.org/uploads/1/3/1/3/131379496/4967024.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/1/0432/6542/5570/files/27731508913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/last_straight_man_meme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/5498017553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/30800096489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/81077149339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/fafivusajedaripirefenaze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/tapuvuduzuvuralunijelafap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4750/1474/files/kogubukusujapejoluvixavo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/pokomoves.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2193/3466/files/daseras.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1537/1932/files/jeniwuzuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/51145144068.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/88962511213.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 8

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_off00005c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C36 5696 bytes
SHA-256: d6b3136911c0d88bf501c9b233d555b0b212cdf4b8140f8ac049c77f1bb82793
font_01_sfnt_off00006f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F89 10468 bytes
SHA-256: 47b9925e09673a70560022f9f5b5b1a6ee435c7594b7cc160348d3049cf52591

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