Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3de653ad4b355ce…

MALICIOUS

PDF

48.8 KB Created: 2020-08-09 20:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3597d02f36fd28d229f82d0e2bef2dc SHA-1: ae53c6a04760a07e8bb0631b8a246e2d9db33ce1 SHA-256: f3de653ad4b355ce37b74c79d95bb711da06f997e030c9b5be33a48643bce6ad
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, constituting a link farm, with one URL pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of the malicious redirector and the link farm strongly suggest 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.ru/pify?keyword=motorcycle+camping+checklist+pdf
    • http://fanufubog.office-furnituresolutions.com/uploads/1/3/2/8/132816202/9139641.pdf
    • http://files.goatskins.com/uploads/1/3/2/6/132681033/rofiv_zixubiseberekok.pdf
    • http://ruwurusix.berrienspringsms.org/uploads/1/3/2/6/132683165/90c80200631b.pdf
    • http://files.profehance.net/uploads/1/3/2/7/132740343/b7f958d23210.pdf
    • http://nikude.brendajoycenichols.com/uploads/1/3/2/6/132695384/rijaweraruzugepo.pdf
    • https://cdn.shopify.c
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/savuruvanew.pdf
    • https://cdn.shopify.com/s/files/1/0433/7329/7822/files/xewurewukegudomidepasinuv.pdf
    • https://cdn.shopify.com/s/files/1/0440/3573/5717/files/bankruptcy_act_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/factorio_8_to_8_balancer.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/types_of_airconditioning_systems.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/lowes_royal_oaks.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6584/files/long_range_mineral_scanner_rimworld.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/60658003887.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/zutiboliziwofunuxipifawat.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9621/files/74062542860.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/28632662919.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/human_behavior_psychology_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/2001/6021/files/bejedelex.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/samples_of_job_application_letter.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_off00007ced.bin
c4fde59430c1b32ce6e4304207aca1459a28295068ff4cb4f79d8d5cfa2528c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CED 5740 bytes
font_01_sfnt_off00009062.bin
d8bd7abfb8fc84068c4eea9c6cdbc32acc0a480afb2af22f88cbaa40a661eefd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9062 10932 bytes

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