Malicious PDF — malware analysis report

Static analysis result for SHA-256 158c2746f5e13fe1…

MALICIOUS

PDF

35.8 KB Created: 2020-07-31 21:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0bcb61dff8c6e1b7e70e6143effe9e5c SHA-1: 5944b8453543186863304c5fdd4a3abd36ff86ec SHA-256: 158c2746f5e13fe1656c053662ea68281f6d07a0b4b99c36ac9f1ca91881a4ca
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to a known malicious redirector infrastructure at `ttraff.com`. This redirector is used in conjunction with a 'free download' lure, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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=elf+bowling+1999+download In PDF document text
    • http://files.sweetdreamsconfectionsco.com/uploads/1/3/1/0/131070178/8d298.pdfIn PDF document text
    • http://files.eastshorechurch.net/uploads/1/3/1/4/131453100/lufimamuxovivu.pdfIn PDF document text
    • http://files.richmondareamensa.org/uploads/1/3/2/8/132815183/vikunon-masupojolemeri.pdfIn PDF document text
    • http://files.czech-club.co.uk/uploads/1/3/1/4/131407227/9289852.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/1/0430/7140/6237/files/30663870002.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3886/6584/files/31744108829.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/gipamuwokudanixofapufipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/16741968193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/nabikuwetovuwubusodofit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5643/8165/files/kikabul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/25167562169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0528/8349/files/xajewomikijesibupogogit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/sotusigogovabolipasip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/xivefusij.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 4

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_off00004cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD6 5196 bytes
SHA-256: 74c3c52c7aca3a4d05ffa87a75ae4942675faff0178b99bd95fea0a75320d646
font_01_sfnt_off00005eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB7 10164 bytes
SHA-256: df7de88036d65bca3f1029eeda9921baf986fa44032c6e1560de14eccd67b9f6

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