Malicious PDF — malware analysis report

Static analysis result for SHA-256 2491e847dfd8b97c…

MALICIOUS

PDF

43.5 KB Created: 2020-07-19 18:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 002c12e30b3b6d57407b47e2d68697d0 SHA-1: 33ef71de5745368e1e45c8238a54f9265e9b82fc SHA-256: 2491e847dfd8b97c0d2e0c0589e2a10b5c8b398591e59dd5d5f6fa602c0071e6
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a 'manual' lure. The presence of multiple SEO-style links further supports the attack pattern of using link farms to distribute malicious content.

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/wb?keyword=manual%20for%20bissell%20proheat%20pet In PDF document text
    • http://files.cavalierbattalion.com/uploads/1/3/1/3/131379477/rusugijapufaju.pdfIn PDF document text
    • http://files.nteu173.org/uploads/1/3/1/6/131606640/1830166.pdfIn PDF document text
    • http://files.mtrainiermonsterz.com/uploads/1/3/0/9/130969522/filesonekadijit_jenopojoz_sazujoso_miforabimawivat.pdfIn PDF document text
    • http://files.midwestdressage.org/uploads/1/3/1/4/131453867/dilibarofaxi_bazemunoruw.pdfIn PDF document text
    • http://files.everlastfilm.com/uploads/1/3/0/8/130814652/lirivovemulub.pdfIn PDF document text
    • http://files.jhwolfanger.com/uploads/1/3/1/1/131164506/gogiruki.pdfIn PDF document text
    • http://files.bradfordscholarship.org/uploads/1/3/2/6/132681456/5622002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wakogokanexu.files.wordpress.com/2020/07/53273631830.pdfIn PDF document text
    • https://digogaba.files.wordpress.com/2020/06/94950999511.pdfIn PDF document text
    • https://rilivot.files.wordpress.com/2020/06/5976034845.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/tajigodoxerolote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/24981554359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/90810796500.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/18141303402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/79606678554.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5300/7516/files/tovapasovezazowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/59911165360.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_off00006e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E08 5016 bytes
SHA-256: 038813ff57c2cc356268508999fd7768695b712a3d85add602d40cf23cf1b71c
font_01_sfnt_off00007f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0B 9824 bytes
SHA-256: e29e3092d621b45efd061a1f3fdfa053756d9c80add517e089718cfde678ea13

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