Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a16fd630e7f27be…

MALICIOUS

PDF

44.1 KB Created: 2020-08-15 00:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c777de2b232368b3815a9fad7f49b293 SHA-1: 4c3a57fa4d71c072ef7ada804f1ababd74cfae55 SHA-256: 1a16fd630e7f27bea4d7ff1d11b39fb5d3f437ce69b513a0468a08a09fe84f2f
152 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to the presence of a link farm containing numerous embedded URLs. One of these URLs, 'https://ttraff.cc/pify?keyword=benzyl+ether+formation', is identified as a known malicious redirector. The document's structure and the high number of links suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=benzyl+ether+formation
    • http://files.t4tenglish.com/uploads/1/3/1/6/131636612/gubujixipev.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/alphabetize_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/ar_nathair_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0093/files/fugugubivu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/tedovafejerezarus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/42332089438.pdf
    • https://cdn.shopify.com/s/files/1/0447/2481/3977/files/game_grumps_video_editing_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/80403763379.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/59572013205.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/59189054115.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/dedevi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/77060985442.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eb8.bin
37912f262ba258e4c35735af433704673e692c1c1bb7f8da7c856758608bab70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB8 5032 bytes
font_01_sfnt_off00007fb1.bin
42290d1b814ed536fa50ad2015569f1c6506f8643b242e8053ca42ca6a11351b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB1 10732 bytes

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