Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5c81788f6f35c3…

MALICIOUS

PDF

47.5 KB Created: 2020-07-27 15:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c96b7305d121f430c09a4b1eb2ccc578 SHA-1: 1d0a3456b3e329a728622ff144dd9c12bea14f6d SHA-256: 4a5c81788f6f35c3d8a05162646382fa8b4810f5dc003f98bb5f505c8b6ff2e1
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains text related to 'Citadel income fund fact sheet', suggesting a lure to disguise the malicious links. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=citadel+income+fund+fact+sheet
    • http://files.sheslayybyrenee.com/uploads/1/3/0/7/130740591/9150687.pdf
    • http://files.danklemencic.com/uploads/1/3/0/7/130775516/e9b1de603171.pdf
    • http://files.adirondackexposure.com/uploads/1/3/1/4/131408369/liperajerew_movusoba.pdf
    • http://files.diabetes-epidemic.com/uploads/1/3/1/4/131453902/f29e33a.pdf
    • http://files.wildfireball.org/uploads/1/3/1/3/131380616/496313ab8447.pdf
    • http://files.sheslayybyrenee.com/uploads/1/3/0/7/130740591/9150687.pd
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/fofomotobazigobeve.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/xawasigipasizinanaxef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/49696710720.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6341/files/7179694788.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/jetewevagusu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/7304407029.pdf
    • https://cdn.shopify.com/s/files/1/0432/1371/7662/files/75369762393.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/82688698760.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/komaxefokov.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/23537277039.pdf
    • https://cdn.shopify.com/s/files/1/0434/3778/5240/files/dogusevapesovisi.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_off00007cb2.bin
cd5c77bbf6a9b9232e743e678982d422834ef55549890fe72fc85c7bd1693f23
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB2 5068 bytes
font_01_sfnt_off00008dc9.bin
2651a367a878bdf6b06311b7e12c73f25893c213791680b2f2bb0d83d52920d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC9 10168 bytes