Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5131fb2b94888f…

MALICIOUS

PDF

37.1 KB Created: 2020-08-21 03:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31402ec18300b2d9b8762e70506d77ea SHA-1: 9bbb1ff913a766c5310190b20c5aea6b1d4fb4b1 SHA-256: 8e5131fb2b94888fe193a8c08a32050dbb47f3d990507e5c75d146ac643e5b1d
152 Risk Score

Malware Insights

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

The PDF contains a lure for 'Maconomy timesheet login' and embeds multiple links. One of these links, https://ttraff.cc/pify?keyword=maconomy+timesheet+login, is identified as a malicious redirector. The PDF also functions as a link farm, with many links pointing to Shopify domains hosting other PDFs. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms a high likelihood of a phishing or credential harvesting attempt.

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=maconomy+timesheet+login
    • http://files.boundlessyogastudio.com/uploads/1/3/1/4/131437157/zuramefixivi_ruziwe_nivug_ximezepapinode.pdf
    • http://tetasa.shirleyanneceramics.com/uploads/1/3/1/4/131408899/c8552df04.pdf
    • http://files.straubconstructionllc.com/uploads/1/3/0/9/130970004/6685560.pdf
    • https://cdn.shopify.com/s/files/1/0432/5995/3312/files/27673921412.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/wajof.pdf
    • https://cdn.shopify.com/s/files/1/0451/6010/4090/files/outlook_template_forms.pdf
    • https://cdn.shopify.com/s/files/1/0437/8640/4000/files/milawikusupobi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56751463133.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/60109991646.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/zikas.pdf
    • https://cdn.shopify.com/s/files/1/0446/7975/7977/files/ktm_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9955/3959/files/18302924156.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.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_off00005439.bin
aa0d21d3ccf064c0bee17ac0c20369f9305b39566ce64690f736d30d20020d9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5439 5224 bytes
font_01_sfnt_off000065e0.bin
b4f21a96541705fece27b59985b9e73dde50d63fb099d3b28012f4899f4493e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E0 9916 bytes