Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73c18a8fabcca77…

MALICIOUS

PDF

33.3 KB Created: 2020-08-14 03:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 03ba88e96051a18d184099a9da3064ea SHA-1: 9c816da25b83b6fe9597cc20479a41234ea42d96 SHA-256: f73c18a8fabcca77ca3912776ff81ff8ec34cee060bca0710eedbe8434979a97
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by a PDF link farm heuristic. The document body contains text that appears to be a lure for an 'epub pdf reader apk'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits.

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/wb?keyword=epub%20pdf%20reader%20apk In PDF document text
    • http://files.al-anon-sc.org/uploads/1/3/2/6/132695525/dexozopejigopaj.pdfIn PDF document text
    • http://files.myscienceday.org/uploads/1/3/0/7/130775396/2626754.pdfIn PDF document text
    • http://files.readyforsuccesskits.com/uploads/1/3/0/7/130739783/2860722.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/1/0433/4767/3253/files/genusuwasezopabolawer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/dewoxeluxisaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1442/2687/files/edward_snowden_memoir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/golikubafis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/95273639235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4073/3341/files/pasokul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9368/0547/files/61449546306.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/9317617156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/32192574826.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/bye_bye_blackbird_by_anita_desai.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/66680249909.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4357/7246/files/solution_manual_for_principles_of_polymerization.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/75555764786.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 2

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_off00004625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4625 4984 bytes
SHA-256: 65533eb8971384f868ed663fa7ff58599345916ee598de08a4c46d8b42b621fb
font_01_sfnt_off00005729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5729 9740 bytes
SHA-256: 27700478bbdba7d18ff454a1974875c4ceb6491d1f3d280d12215660fdceac4f

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