Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555e8d856a1967b…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 16:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da88f097814b9a3970a1405444a08894 SHA-1: 39b1df3a9ef1d7ce478f98c2ab9c3fd25b7b537a SHA-256: c555e8d856a1967b8be39ef45e56825b392df72cf58359d4f62b3acbc64c9051
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The document body contains the URL 'https://ttraff.cc/pify?keyword=aquifer+test+pdf', which is a known malicious redirector. The presence of numerous external links, many pointing to obscure domains, suggests a spam or phishing campaign aimed at driving traffic to potentially harmful sites.

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=aquifer+test+pdf
    • http://wedizilud.rtmb.org/uploads/1/3/1/8/131871721/4633867.pdf
    • http://files.ppddragonboat.org/uploads/1/3/1/8/131857421/wamixapul.pdf
    • http://files.mellowspringfamilyfarms.com/uploads/1/3/1/4/131453253/remuvujol.pdf
    • http://muwuliwaf.pomeroyshpe.com/uploads/1/3/0/7/130776644/61f3efab17f.pdf
    • http://files.comedianambrosejones.com/uploads/1/3/1/4/131407227/dumitumirebekexevox.pdf
    • https://cdn.shopify.com/s/files/1/0429/6799/0438/files/azitromicina_900mg_bula.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1988/files/current_immunization_schedule_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9595/files/51570310362.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9173/files/machine_learning_algorithms_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5521/files/6395018087.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/57649942859.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/giniramopubiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pujipipokumamidepuw.pdf
    • https://cdn.shopify.com/s/files/1/0440/3517/8661/files/vidamufuvujujoginase.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_off000069f5.bin
78f941150830226d199303265f7b87aafe43dbd80cbb09719d0ac219c2e90463
pdf-font-stream PDF embedded font (sfnt) at offset 0x69F5 4908 bytes
font_01_sfnt_off00007abd.bin
c10d07a0d24bdc99e68d61c64c31064be20c1bcd54aa571083f5e1ef2a3d0cce
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABD 10400 bytes