Malicious PDF — malware analysis report

Static analysis result for SHA-256 009fd6cd04a7a1c6…

MALICIOUS

PDF

37.3 KB Created: 2020-08-03 10:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1e4e84a887f8b8cacaa3cb3103c210a SHA-1: 64b804d223c5efb40ef22fada4c7744dcaa3c867 SHA-256: 009fd6cd04a7a1c6f255c3812589644d0bc12cef14f649f62d014dab69563b87
194 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. This suggests an attempt to manipulate search engine rankings or to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=252+281+2218
    • http://files.risdonbrookradioyachtclub.com/uploads/1/3/0/8/130813644/wapiloxuw.pdf
    • http://files.odetobmx.com/uploads/1/3/1/4/131409442/rowefugunafolib.pdf
    • http://files.clevelandtncrawlspaceencapsulations.com/uploads/1/3/0/9/130970004/8517130.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4567/3377/files/fatopabuxiloriwexu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3856/2712/files/xeroj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/98708100623.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/zaxiwamorido.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/suvizevuwuluralu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/bepamuvaferijaforusuvawe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/45615116075.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/zijigeruvulebiporeri.pdf
    • https://cdn.shopify.com/s/files/1/0440/6516/1366/files/13698057259.pdf
    • https://cdn.shopify.com/s/files/1/0429/0586/2307/files/81846287936.pdf
    • https://cdn.shopify.com/s/files/1/0432/6644/1376/files/children_handwriting_fonts.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056ba.bin
98b983aaee5210e692cbaaf8b17c361d3c5bba91de0a1e99ea5a68df6777588f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56BA 4568 bytes
font_01_sfnt_off00006669.bin
6086a2e7760c3984f7a9e88ac9ed30a383c6ab2142b062e1431c7247f69250b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6669 10008 bytes

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