Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c507eda39ab116…

MALICIOUS

PDF

42.7 KB Created: 2020-08-25 13:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228f5626f3e5e4622177385184471bb0 SHA-1: 308d158cb3c259619e10d4a47963cc8e1c307c5b SHA-256: a8c507eda39ab116d3da3d2368110c59a1e45759804dd07b8b02b86844e34970
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains text related to database performance, suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further stages of an attack.

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.com/pify?keyword=couchdb+mongodb+performance
    • http://files.blackstrait.com/uploads/1/3/0/8/130813747/luwup_botenimozix_pitokifelax.pdf
    • https://cdn.shopify.com/s/files/1/0437/5868/2273/files/renikafepow.pdf
    • https://cdn.shopify.com/s/files/1/0461/1388/2275/files/xojonalokukibu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3418/files/53297958346.pdf
    • https://cdn.shopify.com/s/files/1/0432/4491/2802/files/52432033521.pdf
    • https://cdn.shopify.com/s/files/1/0436/9108/1882/files/84795274224.pdf
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/75332913325.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/85122765460.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6589/files/gakafotutajagetegigo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7312/7079/files/52435316071.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/miruduvigupilarazasasag.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/sipidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/maguseperutimiru.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/ruzagog.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_off000068f4.bin
095b056b264be332aee34aa9cfaab7ce29f821b189a930ebab015b8cb21ba3e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x68F4 5404 bytes
font_01_sfnt_off00007b20.bin
5a5a59d10afe54a5917547fcfaa529fbf4689ce3430653bb1e410ae68de319a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B20 10276 bytes