Malicious PDF — malware analysis report

Static analysis result for SHA-256 5818723a72400df4…

MALICIOUS

PDF

40.4 KB Created: 2020-08-07 15:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 718ff74cbe1705b30daa44fa9e1913a2 SHA-1: 4ed17795ae30aba1b42489dace3b5dd7089e4462 SHA-256: 5818723a72400df40b19d506e50d2eb45617f75a0e619020303a28da27598a78
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a search result for a repair manual. This indicates a phishing or social engineering attack aimed at tricking users into visiting malicious sites. The PDF also contains a large number of external links, suggesting it is part of a link farm designed to manipulate search engine results.

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=briggs+and+stratton+repair+manual+pdf+download+free In PDF document text
    • http://files.readwriteinaustin.com/uploads/1/3/0/8/130813301/5405976.pdfIn PDF document text
    • http://wekurut.versewrights.com/uploads/1/3/0/8/130874493/mexuj_nemutadelekili.pdfIn PDF document text
    • http://files.dillylily.com/uploads/1/3/1/3/131380052/budutebineseber_joxeve.pdfIn PDF document text
    • http://files.concordstorefixturegroup.com/uploads/1/3/2/6/132682684/zonudasenazako_zexukepuwuwide.pdfIn PDF document text
    • http://sorabi.fou2asia.org/uploads/1/3/2/8/132814930/156875.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/1/0434/0586/9208/files/zigibelefiti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/20885613271.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/kisojepawaxuguzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3204/2920/files/dasixux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/11465416909.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/25928165165.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/bogotivavivubabuvewigibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/kigovapivizon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6759/5169/files/maladaptive_behaviors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/pupiwisigojelumofexog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/2020_cadillac_sts_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/worawabakejusokoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/41468064794.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8284/6109/files/biochemistry_test_normal_values.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/67474897700.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F29 5504 bytes
SHA-256: 72030d4f22c52314c8a6da4fbd19dddbf4a5f62705b9b8ff207b25871fcb43e0
font_01_sfnt_off000071de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71DE 10032 bytes
SHA-256: 4937734bf3310045677429f922127723ef074c0db8aad24a7514aca573ac373e