Malicious PDF — malware analysis report

Static analysis result for SHA-256 911e76b6b76436d8…

MALICIOUS

PDF

32.4 KB Created: 2020-08-28 07:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee741a422911c1368a10dba765d9d5df SHA-1: 4b40853bcb365d93d744d3c4fae1f6080ab1fa61 SHA-256: 911e76b6b76436d8b978e93c06d91802c9103545f3e6a27781355ebb9f71a774
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to ttraff.com, a known malicious redirector. The document body, though heavily obfuscated, contains the same lure text as the malicious URL, suggesting the intent is to trick the user into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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=exploring+geology+3rd+edition+pdf
    • http://files.oldromancatholicchicago.org/uploads/1/3/1/4/131454143/8218118.pdf
    • http://files.blackwinglabradors.com/uploads/1/3/1/4/131453143/b065e47dd.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/92657437435.pdf
    • https://cdn.shopify.com/s/files/1/0431/8311/2341/files/34749167116.pdf
    • https://cdn.shopify.com/s/files/1/0440/3698/0886/files/complex_variables_and_statistical_methods_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/c_random_number_between_0_and_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/6904/5926/files/pasar_de_a_word_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0436/1660/0227/files/37057280506.pdf
    • https://cdn.shopify.com/s/files/1/0429/5131/1513/files/xifonekuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19463184481.pdf
    • https://cdn.shopify.com/s/files/1/0437/1657/5383/files/inverse_of_matrix_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/tawagusegevedumirazaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/zabixuxigojuxozafepiju.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/astm_e832.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_off0000445c.bin
d3357e4791a61b6953539e0f4e9660142f2800af4953e662e3520ecdd06434a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x445C 5112 bytes
font_01_sfnt_off000055e0.bin
8214b28a1158caf3a14c8fade1878469d0a3216538d9cbb6dbf619d54b565d50
pdf-font-stream PDF embedded font (sfnt) at offset 0x55E0 9140 bytes