Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a99ae9e703fc9c…

MALICIOUS

PDF

71.6 KB Created: 2020-08-05 12:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3328c956c6395080e621d4584e049fea SHA-1: 9fe80f3d3c4d05e5329a818ce757ebc7c67b897a SHA-256: b3a99ae9e703fc9ca33c546b9493e6354065ab3281e3a29ac3aebce20ffb5585
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious URL (ttraff.cc). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files, suggesting a link farm or redirection tactic. The primary attack pattern involves luring users to malicious infrastructure via a link farm.

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=aachen+travel+guide+pdf
    • http://files.cikopano.net/uploads/1/3/0/7/130776498/lilinivovufotokenej.pdf
    • http://files.gvramigos.com/uploads/1/3/1/4/131408772/xadipimusomi-rimejiwimot-mubewe.pdf
    • http://files.htagmedical.com/uploads/1/3/0/8/130813118/naduwaj.pdf
    • http://seviwivo.carelessheart.com/uploads/1/3/0/7/130775045/2937040.pdf
    • https://cdn.shopify.com/s/files/1/0429/1103/9655/files/kujapezexanilodakepozu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/rebuvumeturom.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/vuzudoluruwakawej.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/24149954007.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/dojenatuwisisitejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/rasaxorupus.pdf
    • https://cdn.shopify.com/s/files/1/0434/9798/0056/files/fazurawatorewelobobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/16_inches_in_cm.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/govivupazafakumodum.pdf
    • https://cdn.shopify.com/s/files/1/0437/1854/1480/files/regulation_et_automatisme.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9399/files/serengeti_legal_tracker.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/8176844681.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/jexoxe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b45a.bin
5b203c8b0402e8a8d997457b05d3067681cb443656477d79fd91d53bf45679b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB45A 5060 bytes
font_01_sfnt_off0000c584.bin
23c462759ac01622bf666a992ca639404d1ab00ad4ec378886359c52db9897b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC584 10744 bytes
font_02_sfnt_off0000ea69.bin
f972c92728ffbc6e4c0c7cfb62563c85dbf9e0da10a33f520dda274d733fa841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 17184 bytes
font_03_sfnt_off000102aa.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 4324 bytes

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