Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd7e19b49ef066a…

MALICIOUS

PDF

42.4 KB Created: 2020-08-13 21:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f74f97756d559ab896cc4c990fbdd7af SHA-1: 638f0792cb97426c40ab96f7df1b126ac20b4869 SHA-256: 5bd7e19b49ef066a04eb86721557530bea068b398426aa48bac68f4a3c7b1c91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. It also exhibits a PDF link farm heuristic, containing numerous links to external PDF files, many hosted on Shopify. The embedded document body text, though corrupted, contains the malicious URL and appears to be a lure for 'tamil christian messages free'. The combination of these factors strongly suggests a malicious intent to redirect users to harmful 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.com/pify?keyword=tamil+christian+messages+free
    • http://files.colwynnetballclub.co.uk/uploads/1/3/1/1/131163856/rafifovuwon.pdf
    • http://files.emapparelltd.com/uploads/1/3/1/8/131871740/9050061.pdf
    • http://files.allazoleadership.com/uploads/1/3/0/8/130874012/9437c2a301da1.pdf
    • http://jafij.laharrell.com/uploads/1/3/0/8/130874276/pevelo_forelux_dufikevofonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16779745642.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/28566870597.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/96629570665.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/tuxaxirif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/xoxebabatex.pdf
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/25746744822.pdf
    • https://cdn.shopify.com/s/files/1/0440/0594/9590/files/alejandro_magno_historia.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/four_temperaments_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/baremuxab.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005240.bin
374118858b28d0dad0352c05659b53258861dcd995d53f28eb1166982059b982		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5240 5244 bytes
font_01_sfnt_off000063e7.bin
fe0fdf79a38b412298771fd5b91f7858b9bd11cb5e6ba63ad6e9bb223f6a69f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E7 6340 bytes
font_02_sfnt_off0000787f.bin
d247d08c4297778b84193ee29badb38e066903f8d2ff9a54bc24fa030085a026		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787F 10680 bytes

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