Malicious PDF — malware analysis report

Static analysis result for SHA-256 88920b78cbdba8be…

MALICIOUS

PDF

52.2 KB Created: 2020-08-30 02:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d260e0ace539cdc4aeadd56b9deacd63 SHA-1: a1b054659978bf407a691e4d5806e0b626d191e6 SHA-256: 88920b78cbdba8bec20511c23c9950ce97d213d0c10bc2be46aa87622e9d6fd1
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Comptia a 1001 and 1002 for dummies' and the malicious URL, suggesting a lure to a phishing or malware distribution site. 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.ru/wix?keyword=comptia+a++1001+and+1002+for+dummies
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/apache_spark_in_action.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/vagajuxiketipan.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/16928505969.pdf
    • https://static.usrfiles.com/ugd/b8c837_24eca2a73b324c8b913d0c713845b476.pdf
    • https://static.usrfiles.com/ugd/b8c837_06f4b874ea354103be66a26c2c57c641.pdf
    • https://static.usrfiles.com/ugd/5926b4_5255e35838334a00832c4fed3e90ab97.pdf
    • https://static.usrfiles.com/ugd/b8c837_af2a928ca80a46f1a13767b78b44bd9d.pdf
    • https://static.usrfiles.com/ugd/4c1554_fcf99d3afc784b189e6513c14b6de854.pdf
    • https://static.usrfiles.com/ugd/b8c837_bec52d215bef415bab6634e77357ab05.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb85f8d451344c7da67c9493bbe4e31d.pdf
    • https://static.usrfiles.com/ugd/1849a1_9bd2ff5700544351aff568fdea07b9b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1945de8c2834e48916708e4aeb9e4e6.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_off00008db3.bin
05ba91e6d41b4f104a3e9e6f426f75f9219e18170a73358485105a656bf28234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB3 5384 bytes
font_01_sfnt_off00009fe3.bin
c2d6704d086bea7f149adb7b862c8cbb50ea72e2ba486ca8043fbac2eb155ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FE3 11096 bytes

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