Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d8e0d02ee05a61…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 23:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f16ae64a5577fe4b1a5ee56cdfbe6fb0 SHA-1: 1fa606368fde5291692003d8ef25c62955474b7a SHA-256: f5d8e0d02ee05a610482a7d3cb48c45686f3a03efb46af6e3ce13a20bed40a6c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'robbery bob apk 2' and the URL itself, suggesting a lure to download potentially malicious software. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing further supports this. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=robbery+bob+apk+2
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/57187507890.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/list_of_common_logical_fallacies.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/morphology_of_cell_injury.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/70900379121.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/89630652917.pdf
    • https://cdn.shopify.com/s/files/1/0432/1679/7857/files/list_of_magic_8_ball_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/0741/6219/files/business_process_management_tools.pdf
    • https://static.usrfiles.com/ugd/b8c837_31facdb28ae3470c841cfb5e3d84d451.pdf
    • https://static.usrfiles.com/ugd/96768c_ddb303b1711843aa969b79d2a12d92fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8da0a2ebd3c435982535227b14ce1df.pdf
    • https://static.usrfiles.com/ugd/b8c837_48dfbe299e9a4f2b8cf9536bfa38540c.pdf
    • https://static.usrfiles.com/ugd/fe83c3_b1cdf3f5f67448f0bf4e96eba41c2831.pdf
    • https://static.usrfiles.com/ugd/930050_223eee65688d4af69847ee2e901ff516.pdf
    • https://static.usrfiles.com/ugd/37321e_0421635d30c94567bb812f6d507c338e.pdf
    • https://static.usrfiles.com/ugd/516793_3b393eec53764b6b987b4513b7754131.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_off00006468.bin
c9ab5c76c69677f06cc4191576e0fb1b49cac727a60214b03f0968ba6d08b02d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6468 5048 bytes
font_01_sfnt_off000075af.bin
d8ecbe265695bea592dd10e0623864ddee42b4b704e6b279cc35e49190900ef8
pdf-font-stream PDF embedded font (sfnt) at offset 0x75AF 9892 bytes