Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d16fe8590c99c26…

MALICIOUS

PDF

43.6 KB Created: 2020-08-26 01:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87bb4eb1197a8bf26de5261ed064f9a SHA-1: ac90e9127152e0adbd83b7cdb313ad698e2ede1c SHA-256: 2d16fe8590c99c2693695c566836278ffe1cb592eee22b287051b22e0d1bbe01
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be SEO poisoning, directing users to potentially harmful content via the ttraff.ru domain.

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.ru/pify?keyword=dragon+ball+z+ultimate+tenkaichi+tag
    • http://files.leacouture.com/uploads/1/3/1/6/131606923/1569319.pdf
    • http://files.onthecamino.net/uploads/1/3/0/8/130815213/5669839.pdf
    • http://files.pa-di.dk/uploads/1/3/0/8/130813904/dc53324de28202.pdf
    • https://cdn.shopify.com/s/files/1/0434/1684/6488/files/vazadud.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6982/files/78276225578.pdf
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/vukevotudemoluxoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/64949280722.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/51686905797.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41326774972.pdf
    • https://cdn.shopify.com/s/files/1/0438/2759/3376/files/likixisigutos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3357/files/77691227753.pdf
    • https://cdn.shopify.com/s/files/1/0436/9488/2984/files/fybsc_it_imperative_programming.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_off00005fad.bin
b6de8692b44441418c7c8a23356f3ad797be495f50adeb9657f6ef1f197b6bbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 3528 bytes
font_01_sfnt_off00006c29.bin
d95d87a9a517d27c59c420fee8de05e34ed84af959bba0ef51deaf54b1bf90f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C29 5288 bytes
font_02_sfnt_off00007e06.bin
94d318742f081b37f251e2ae69d707883125f4a2f2efaa648e63ce765cd57ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E06 10420 bytes