Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb641d14f9e7658…

MALICIOUS

PDF

45.9 KB Created: 2020-07-24 15:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 84ab51a3f5023f7f5da8e8410f6d4a45 SHA-1: 69ff2369dd1c3d3e3e8fcf377704c3f93b05122b SHA-256: 1eb641d14f9e7658ef1b6323f6187d3fd526be69adfa6818b646acbe74a815a7
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be related to exercises, likely a lure to disguise the malicious intent. The primary attack pattern involves directing users to potentially harmful websites through these embedded links.

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=biceps%20tendonitis%20at%20elbow%20exercises%20pdf In PDF document text
    • http://files.redi-callusa.com/uploads/1/3/2/6/132681045/tipofeme-mapasilabi-famol.pdfIn PDF document text
    • http://files.litvaklab.org/uploads/1/3/1/4/131438583/f72229.pdfIn PDF document text
    • http://files.heavenbeam.com/uploads/1/3/1/4/131438397/vogerasa.pdfIn PDF document text
    • http://files.hoffmanhornetband.com/uploads/1/3/0/7/130740385/3516679.pdfIn PDF document text
    • http://files.nhsvolleyball.com/uploads/1/3/1/1/131163559/234907.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/1/0439/4686/8891/files/vibamofironupupuris.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4944/1688/files/64229175292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/7372488079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0862/1719/files/92395423531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2211/3173/files/tijekivusugovinekebefe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0763/1779/files/zamoxorivil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/lupijus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6286/1730/files/45438445508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/56155591574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7451/8178/files/tesuluwidenopekapikori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/78380492122.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2732/4310/files/13192555108.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/rosiwokoperaboruwib.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 7

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_off000074e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E9 5284 bytes
SHA-256: cd344a91e4ea94b484db44716e88e6e31a633ddcb23f24424420fabf57a6ea94
font_01_sfnt_off000086f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F1 10212 bytes
SHA-256: 74b755d76b7e84b5444883308f3d4b3900ab71ed3c8ceda4b3473c58802c2f50

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