Malicious PDF — malware analysis report

Static analysis result for SHA-256 db27bebce19fd841…

MALICIOUS

PDF

44.4 KB Created: 2020-08-09 16:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b1fa2c9cd69c37324405c3ab0740b08 SHA-1: 6f51f5a5fa1bbabc54930a2d219f53fddf28be3c SHA-256: db27bebce19fd841a9fdfdb6863d3ca913e99977aa62c7df1c49cf99bdceec42
154 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple external links, including a known malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary purpose is to lure users to this redirector. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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=psychology+of+love+pdf+download
    • http://files.chimneysweepyorkshire.co.uk/uploads/1/3/2/6/132681586/xagugagijutafesem.pdf
    • http://files.madeinthehood.co.uk/uploads/1/3/0/9/130969498/jakemowa.pdf
    • http://files.morrisiennafarm.net/uploads/1/3/0/8/130814050/bf86e72ddb01.pdf
    • https://cdn.shopify.com/s/files/1/0429/9679/3503/files/38187585918.pdf
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/noruxatuvewipupusani.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3126/files/36264820926.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6541/files/42848016433.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/fixaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7485/4812/files/pelaporan_keuangan_dan_standar_akuntansi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1253/files/xedububureko.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4080/files/98376428177.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ea.bin
f3ebb7808dfa5e8b6ae38a349ba9ccc043d4622729febc982be04fa3a2158d39
pdf-font-stream PDF embedded font (sfnt) at offset 0x61EA 5236 bytes
font_01_sfnt_off000073c7.bin
831e2cc87851b3531c9386bc6fdcc2a105ed1039ccc6c44c1e14b5d6f9a84e74
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C7 10304 bytes
font_02_sfnt_off000096fc.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x96FC 4324 bytes