Malicious PDF — malware analysis report

Static analysis result for SHA-256 5004bcccd0fd6bfe…

MALICIOUS

PDF

53.0 KB Created: 2020-08-31 21:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2afe3dcf6a7aa8941b86c5cd66685b4 SHA-1: f778763bfeb577c05ec09b80d78efc54e263ed7e SHA-256: 5004bcccd0fd6bfe596341d5e03739d079a21ad70fd24782e8b355d521f9fbc6
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=blaster+transformers+art'. Another heuristic indicated a PDF link farm, with 17 external PDF links, predominantly hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.cc/wix?keyword=blaster+transformers+art'. The combination of these factors strongly suggests a phishing or malware distribution attempt.

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.cc/wix?keyword=blaster+transformers+art
    • https://static.usrfiles.com/ugd/10e3af_13dc98d0c6504d1f835fda3daeaca278.pdf
    • https://static.usrfiles.com/ugd/d902bb_0884d1306c5948fe9f956f712513df09.pdf
    • https://static.usrfiles.com/ugd/7e6083_f2c0ba78f61e4b25b8bc102f36508c65.pdf
    • https://static.usrfiles.com/ugd/0dd040_865d7e00bd47472299e92d66fb1053db.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f6098a780084613aac26b7d57425968.pdf
    • https://static.usrfiles.com/ugd/16a96a_4481669edb3340e0a554fa67fd7679bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5da69e4631440b58f7fcf8c8e94b7ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e0498905ca24b85803a9b1034aec93a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b89788869c5943fcbffa2295ffcc492d.pdf
    • https://static.usrfiles.com/ugd/77d535_84176dc30fe64e0291008cc79f8ecc23.pdf
    • https://static.usrfiles.com/ugd/2e16aa_b9a9e84aadcb4dc89a66107ddddd96a0.pdf
    • https://static.usrfiles.com/ugd/c3f59f_e40e9c23700244569f155d8b551cfb9d.pdf
    • https://cdn.shopify.com/s/files/1/0440/2734/7109/files/introduction_to_cataloguing_and_classification.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/64680280675.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/osim_foot_massagers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3808/0166/files/pexufitun.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/multivariate_statistical_process_control.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_off00009259.bin
aff9461127f3954d3374a2879758a5ec9a79f1663b8cc6f7454bd3990d5d1b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9259 4964 bytes
font_01_sfnt_off0000a325.bin
c1b2c24b8449b5d3726a9e3675417ae3d83fd83b47c916fe793a3a9144801faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA325 10556 bytes

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