Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1af4da20e1e6de…

MALICIOUS

PDF

41.9 KB Created: 2020-09-04 05:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff17986cda93aa82a3707ad4de67536 SHA-1: 12e559e08ea2ed7dcbf8c94cc6b03006c41943d1 SHA-256: bc1af4da20e1e6de3529ddfed5b140f582c1dc480388011e2fb7d9d197e25821
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=phenolic+sheet+laser+cutting'. Additionally, it exhibits a PDF link farm behavior, embedding numerous external links, with the first being 'https://cdn.shopify.com/s/files/1/0431/9582/6336/files/dictionar_neologisme.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious redirector URL is the primary indicator of 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.link/wix?keyword=phenolic+sheet+laser+cutting
    • http://www.mcm
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/dictionar_neologisme.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/96657142626.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56773010908.pdf
    • https://cdn.shopify.com/s/files/1/0436/1561/7182/files/ielts_writing_task_2_criteria.pdf
    • https://cdn.shopify.com/s/files/1/0452/1564/5856/files/jakupuji.pdf
    • https://static.usrfiles.com/ugd/85c99c_1e2bd0f6c53046d9afdfbbe0081cbfb3.pdf
    • https://static.usrfiles.com/ugd/07625c_514c9913dac14b01acaaca73cbe3fdc2.pdf
    • https://static.usrfiles.com/ugd/b9801a_a5f5a28f99af4a7d82b976d06760c6e0.pdf
    • https://static.usrfiles.com/ugd/d79848_5b6f1394550f4ce68bbd67eae86b0ef5.pdf
    • https://static.usrfiles.com/ugd/b8c837_997157d551bc4884a913108b97e2cfbe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7011/files/kudijuzajimodow.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/kusubojexunujugurekin.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/10th_english_synonyms_and_antonyms_list.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_off00006129.bin
f0193b41dbd8287cf1131ed7bc007df4143ccaa2447f4affade4ed01ae608431
pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 5060 bytes
font_01_sfnt_off00007260.bin
ff4b585f45359899c9e7506696cf9aec0747fe3d4fd1945ba96fbbf1242b9813
pdf-font-stream PDF embedded font (sfnt) at offset 0x7260 12776 bytes