Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c53c7edb1ff12e3…

MALICIOUS

PDF

37.0 KB Created: 2020-08-06 23:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f082d8d381b76f18a8f447110c763ff8 SHA-1: 675e7363fa2275f7b421c1a355cd4143b9a19c93 SHA-256: 0c53c7edb1ff12e3c1139b8cdc647f3cbfcdde16ea810e348597c03f8eb125b7
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on Shopify and appear to be part of an SEO link farm designed to attract users searching for free book downloads. The primary redirector URL, https://ttraff.ru/pify?keyword=mathematical+analysis+by+tom+apostol+pdf+free+download, is flagged as malicious and likely serves as a lure for phishing or malware distribution. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or content-scraping operation.

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=mathematical+analysis+by+tom+apostol+pdf+free+download In PDF document text
    • http://files.embedchange.com/uploads/1/3/0/7/130775320/2563859.pdfIn PDF document text
    • http://files.chinatownbranch.com/uploads/1/3/1/3/131380467/1307638.pdfIn PDF document text
    • http://files.designtimegnc.com/uploads/1/3/0/8/130874587/pogerujumi.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/1/0433/7677/1224/files/seleguteke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2626/7816/files/6083812408.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3016/7202/files/jexisezeni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/adobe_acrobat_reader_dc_edit_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/49123152686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/gapofuzukise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0163/4213/files/.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/3717/5456/files/mk_dc_fatality.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/pamajexupewekopefesutata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/fallout_vault_69_cheat_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4062/8133/files/mad_city_gangster_life.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/23083528236.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5185/0647/files/annotate_ipad_dropbox.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_off00004e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E54 5732 bytes
SHA-256: e6fa42edf1f148899cfbcd37b62f137b3b2fbc9bd640a789fad84a8a1771acfe
font_01_sfnt_off000061cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CF 11320 bytes
SHA-256: 76abd0bd920a0658d1458854ebef5db663c7bd575101b7629a1416836be728ec

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