Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8098613657837b6…

MALICIOUS

PDF

51.3 KB Created: 2020-08-17 06:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd2aa9866e709827625e22084b8ad1a3 SHA-1: a52edc6754d2d96844ef01297f0c1994a149438d SHA-256: a8098613657837b6f0b8d059ec640ad91aabfbb6b6374052bc4ce316b6ab56d3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure for free music downloads on Android. This link is designed to redirect users to malicious infrastructure, likely for further exploitation or malware delivery. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm for SEO manipulation to distribute the malicious PDF.

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=app+descargar+musica+gratis+android
    • http://files.tamenne.org/uploads/1/3/0/8/130814017/verufibojise.pdf
    • http://zikasusam.consciousrobots.com/uploads/1/3/1/4/131406343/1739347.pdf
    • https://cdn.shopify.com/s/files/1/0437/6474/4343/files/software_engineering_process.pdf
    • https://cdn.shopify.com/s/files/1/0433/7749/2118/files/budismo_principios.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5901/files/vufinoginorija.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/51134442050.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/leravuzorupigukutej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/31071156316.pdf
    • https://cdn.shopify.com/s/files/1/0435/4686/9911/files/jagupilikofimajimutiloxuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/55855700219.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/94043015041.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ec0.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC0 6744 bytes
font_01_sfnt_off00007fa7.bin
f1886ce1f73baa442060d865523789c1f44b6d64d27f3cc12d3e3d010dd6378a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA7 5352 bytes
font_02_sfnt_off000091b9.bin
a30cb40fa02cf2a0ce4028f36abc23b35ff2f8a27dfb78ed15de8d799b85a339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B9 2628 bytes
font_03_sfnt_off00009ce2.bin
993bf526ab1548cf7b30871c763506be22f4cd65002f801e04a168aa3d9a01bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE2 10176 bytes

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