Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca80d1fa7391a46d…

MALICIOUS

PDF

40.4 KB Created: 2020-08-17 02:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e42fd4653c899b826a4b3c8dbf5187a SHA-1: 835ae46c346ff15d13a4b32fbd078619cf21f1b8 SHA-256: ca80d1fa7391a46de975c4317c2afaa939c6eeed8776b4a0a95a731ecd750a2f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=base+sequence+of+template+strand, which is likely used to direct users to further malicious content. The document body itself is heavily obfuscated, but the presence of numerous links and the ML classifier output strongly indicate a malicious intent to lure users to harmful sites.

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=base+sequence+of+template+strand
    • http://reweb.feastofstbrides.com/uploads/1/3/0/7/130775537/pisaxoz.pdf
    • http://sawuka.paintedplanet.net/uploads/1/3/1/4/131454106/d3e39101959f4c9.pdf
    • http://files.seanysshop.com/uploads/1/3/0/9/130969680/9276472.pdf
    • https://cdn.shopify.com/s/files/1/0436/5923/1385/files/interpretacion_de_una_biometria_hematica_completa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7364/2389/files/pemog.pdf
    • https://cdn.shopify.com/s/files/1/0452/7898/6402/files/describing_things_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0983/files/31538681654.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/bavusotelenuxiwuraveli.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/61367250327.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/kebesemajukozowu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/73038932916.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/fomixetiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9841/files/16211156039.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/betakebakedaduv.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_off00005f5b.bin
86f45db22820fa2fc848745353635711fb6afd9d188928dd61350e46311f6d87
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5B 5476 bytes
font_01_sfnt_off000071dd.bin
94691e948b148bbdbaee50a1d965da866637815f7f1c18cc81ee51e9944d0ee6
pdf-font-stream PDF embedded font (sfnt) at offset 0x71DD 10300 bytes