Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36373254c5f2df0…

MALICIOUS

PDF

42.4 KB Created: 2020-08-15 00:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d746da7ed9a96c677a9b3444d7a55e SHA-1: 7b943c3ab58f8a977d53786d09dda3a9a4290ee5 SHA-256: f36373254c5f2df0e38ad7a87d8c918d4036483c28d5b6ded214eea826d7a390
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=story+of+my+life+essay+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to essays and the PDF creation tool, suggesting a lure to download or access malicious content. 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.cc/pify?keyword=story+of+my+life+essay+pdf
    • http://wubomopa.okomomodesign.com/uploads/1/3/1/4/131407089/bidesadatiliris_fovavatevu_wawomami_dinedire.pdf
    • http://files.gumbogiftsandgallery.com/uploads/1/3/0/7/130740513/2916469.pdf
    • http://supumeme.zshboo.org/uploads/1/3/0/7/130775195/lowud.pdf
    • http://files.pennyormsbee.ca/uploads/1/3/1/6/131606758/kaxibedawegadoja.pdf
    • http://bujik.dididiphotography.com/uploads/1/3/1/6/131606490/rofekewus.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/jirivofavatosukulelizifik.pdf
    • https://cdn.shopify.com/s/files/1/0448/0296/5665/files/los_pensadores_daniel_boorstin.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/releninibijexotulajutavur.pdf
    • https://cdn.shopify.com/s/files/1/0447/5600/9111/files/44848143531.pdf
    • https://cdn.shopify.com/s/files/1/0434/7461/6473/files/8195619347.pdf
    • https://cdn.shopify.com/s/files/1/0434/8733/0464/files/jitunabuvoxonov.pdf
    • https://cdn.shopify.com/s/files/1/0439/1059/4728/files/topozidus.pdf
    • https://cdn.shopify.com/s/files/1/0432/3265/7575/files/90774857248.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/network_layers_protocols.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0798/files/beyond_good_and_evil_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/both_and_either_or_neither_nor_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5995/files/18336997379.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_off0000680a.bin
08251e59be3c3e5caa599387598871140e71fa851d1db89a9eee3cc0541a3b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680A 5392 bytes
font_01_sfnt_off00007a4a.bin
8d8fe4c3afe9332129335e0cdfdeb8acf42e8547f124d1c59894d7538160165c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4A 9880 bytes

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