Malicious PDF — malware analysis report

Static analysis result for SHA-256 06540a7f54d9906a…

MALICIOUS

PDF

42.3 KB Created: 2020-08-30 01:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 722750a80b51b8e2b09876231aec53d1 SHA-1: 8888e58a05dbbfe45781db2bc9918e2e6a6a370e SHA-256: 06540a7f54d9906a53670c9bac39e452eabd769babce626dc9f9919d51e9aeef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector, designed to lure users into clicking on potentially harmful content. The document body, while heavily obfuscated, contains text related to interview preparation and includes the malicious URL, suggesting a social engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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/wix?keyword=analytical+reasoning+questions+and+answers+for+interview
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/kuluruzadusikepabosaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6092/8405/files/65562040097.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/92069246358.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/new_headway_beginner_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/rewidi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5475/9065/files/33755728885.pdf
    • https://static.usrfiles.com/ugd/ab922d_f687f1061ee043ef961258a3fe2db225.pdf
    • https://static.usrfiles.com/ugd/0511f5_1119f4422e004afc9a708dd00b6753f7.pdf
    • https://static.usrfiles.com/ugd/0aab01_4774a093d50e486e8056fd6408a4c9ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5c203be6fd04277a123e4f82d50e7ba.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_3bc6daf2ede4410ba4bb1587e768438d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b524e3e52823497fb1243a0ed86b36d1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ca.bin
96676b72ced7fb0b758eb3fc6a8ab137db5c74ab117bf4052f5286ba9a066e0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x66CA 5560 bytes
font_01_sfnt_off000079c7.bin
8e69a19ff346122e4ed13a9cb739157986a2d7bf48442b73ee49944a5208352a
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C7 9996 bytes