Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b5b4d4aa800e56…

MALICIOUS

PDF

43.9 KB Created: 2020-08-06 13:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3fb75d1a95527fecb7bc72f921bd90f SHA-1: e306bdcca7d6e1819a7bd9c78a2089ae7119b58e SHA-256: 19b5b4d4aa800e56114ee3178b1f3c3c2f9bef794cda0a98a937c1b58dd724c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass of external links, including one to a known malicious redirector at `https://ttraff.cc/pify?keyword=acute+bilirubin+encephalopathy+pdf`. This suggests the document's primary purpose is to redirect users to potentially harmful websites. The ML classifier strongly supports the malicious nature of this PDF.

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=acute+bilirubin+encephalopathy+pdf
    • http://files.flykingzcollection.com/uploads/1/3/1/4/131438161/jilamu-wereku.pdf
    • http://files.ivychurchbristol.org.uk/uploads/1/3/2/6/132681976/rinulosuzigipoxi.pdf
    • http://files.olympiaskate.org/uploads/1/3/1/8/131871439/98adc.pdf
    • http://files.mxvisolutions.com/uploads/1/3/1/1/131164424/tujufusaterewed_jebekaju_perofonutib.pdf
    • http://files.andersonboergoats.com/uploads/1/3/2/7/132712451/3792799.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/xevelosese.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8052/files/ge_xl44_igniter.pdf
    • https://cdn.shopify.com/s/files/1/0440/9029/4437/files/wilozam.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/age_of_wonders_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4551/files/kenmore_dishwasher_model_665_parts.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bolosenisom.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/bunipibegaguvepufejazi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/63971881124.pdf
    • https://cdn.shopify.com/s/files/1/0428/4442/2310/files/jiram.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/58737986526.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/77683724443.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/bharat_ratna_award_list_download.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_off00006dc8.bin
1973ff09fc8d5562b2ccbcc15bd1cebf5a03a58aeb8be0728637a4bf4ab472c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC8 5296 bytes
font_01_sfnt_off00007fca.bin
403f4c24024ba9d2b24678bbd81a09a4a3c06151a5a92aff5d1c337831293629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCA 10144 bytes

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