Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cd5d07d0972604…

MALICIOUS

PDF

46.6 KB Created: 2020-08-06 15:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 79c353372df173b5416e4430ef3a45d8 SHA-1: 2a34ecf5e4d43c66cd674f09887280123dd7ff7f SHA-256: 99cd5d07d0972604d7a273603db4b8c3b8026c6fd8f210ed1b654be4a423c578
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains hosting other PDFs. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body text and embedded URLs suggest a lure for downloading 'aptitude questions', likely a pretext to redirect users to malicious sites.

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.cc/pify?keyword=tcs+aptitude+questions+and+answers+with+explanation+pdf+free+download In PDF document text
    • http://files.mycbmc.com/uploads/1/3/1/0/131069899/4c11aa.pdfIn PDF document text
    • http://jifal.amberlynnphotographyllc.com/uploads/1/3/0/8/130874655/tabovulowivodotopi.pdfIn PDF document text
    • http://files.ballycastlehistory.com/uploads/1/3/0/9/130969139/0ad0002e636e.pdfIn PDF document text
    • http://files.thebettajivereview.com/uploads/1/3/1/4/131438011/relur.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/1/0438/3365/5446/files/for_loop_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1619/1138/files/bixalulezivasuvenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/00325-_95800-_00000-_aaoem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3141/3404/files/87523625101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/bexedepejedokezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/8151/8494/files/elektrik_arpmas_tedavisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zamujogeve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/upkar_english_speaking_course_book_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39720928980.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_off000075ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 5480 bytes
SHA-256: baca366d4888f56ebe308bf56bde058fb7192909700a0b6c3f61c03e79d8dd5d
font_01_sfnt_off000088b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88B6 10808 bytes
SHA-256: e544360f6d341613107e049b0706e759c677502df170491801a3bf60cf05a961

Open this report in the interactive analyzer, or submit your own file for analysis.