Malicious PDF — malware analysis report

Static analysis result for SHA-256 efefcd9b4e4b249f…

MALICIOUS

PDF

37.9 KB Created: 2020-08-27 20:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b2e2e16048f30132ad57b8f7c2f7ac SHA-1: 2518eabce0de8e50b5586083576ed999a8d24e3d SHA-256: efefcd9b4e4b249fb27965c4fd9a68f315895f341136bb283cbf9170e61fb395
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'building construction illustrated 4t', which appears to be a lure, and embeds numerous URLs, including a primary redirector at https://ttraff.ru/pify. This suggests the PDF's purpose is to lure users into clicking malicious links, likely leading to further compromise.

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.ru/pify?keyword=building+construction+illustrated+4t
    • http://muwakofad.huskyhistory.com/uploads/1/3/1/0/131071057/matotozusirek-fiwafujumew.pdf
    • http://files.kimfirmston.com/uploads/1/3/1/4/131453990/933876.pdf
    • http://files.radyo-filipino-australia.com/uploads/1/3/2/6/132683154/3953964.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/zobefosuziwanonimimaja.pdf
    • https://cdn.shopify.com/s/files/1/0430/4837/0333/files/59719163186.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/xuduragagurazolokunoso.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/in_my_life_beatles_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5290/files/fanon.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/5995/files/activer_les_cookies_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3082/files/kisedudevip.pdf
    • https://cdn.shopify.com/s/files/1/0432/6303/3502/files/96312252284.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/american_association_of_blood_banks_technical_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/2600/4642/files/35510393582.pdf
    • https://cdn.shopify.com/s/files/1/0432/1683/0632/files/47959980806.pdf
    • https://cdn.shopify.com/s/files/1/0465/0228/1374/files/44197662713.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/antibody_structure_instability_and_formulation.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_off00005643.bin
cabc693558136e1754995e2094780779802f115acb6b20dd0084d818cdffdded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5643 5244 bytes
font_01_sfnt_off00006822.bin
319325ad46b23907be23748b0fcb366997443e7a3981424c97fed8db6a7bf224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6822 10060 bytes

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