Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d42844468df537…

MALICIOUS

PDF

47.5 KB Created: 2020-08-06 21:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d33f687f8e2430e937e1a571480c78be SHA-1: 2ad357d31112ac09ea3867791d91f8b66034a1d4 SHA-256: 76d42844468df537adef07bee024de7532e2bb19cbabf1a31ecd8c34628cadcb
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) that appears to be part of an SEO link farm. The document body, though heavily obfuscated, contains text related to academic writing and includes the malicious URL, suggesting a lure to drive traffic to potentially malicious or ad-heavy content. No scripts were extracted, but the primary attack vector is the redirection to a malicious link farm.

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=academic+writing+english+alice+oshima+pdf In PDF document text
    • http://files.holmesscience.org/uploads/1/3/1/8/131856270/puxugafujewulo-kufupubal-gofaj-fipaluzole.pdfIn PDF document text
    • http://files.elmschoolofrealestate.info/uploads/1/3/0/9/130969004/ratag.pdfIn PDF document text
    • http://files.mijblaxby.com/uploads/1/3/2/7/132710797/fefirozulun-rulujudo-bosajipobatin.pdfIn PDF document text
    • http://kajexe.nextlevelgamex.com/uploads/1/3/1/4/131407406/57e171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/94839117961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/xezekofumude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5526/8518/files/64482694947.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1181/6099/files/aquarelle_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/58817950460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/xiniluvobijawumugerib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5393/2966/files/velaxevaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/surujux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7049/6661/files/59463847202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/vojemug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/nobody_s_perfect_lyrics_hannah_montana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7442/9852/files/3293493110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/gowebivilodaruvajenuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2503/8497/files/33880267204.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A23 5652 bytes
SHA-256: 8330707967f1f54955fe5fcccd5c0eb5d8c2f94aaf57f0f4f6f33d56edc107f1
font_01_sfnt_off00006d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D37 12492 bytes
SHA-256: 633246771cffc6e91beb42caf3d562244f2386513835483988def4160459c3ce
font_02_sfnt_off00008ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA1 9876 bytes
SHA-256: 2f879dc135d1dea52d982d49b713525688c1f86d3ace369e38ac9d2b8bb6f964