Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7726a524d857f21…

MALICIOUS

PDF

52.7 KB Created: 2020-08-25 00:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9c0ed1b093773d26ca91bc2d3130586 SHA-1: 8cead2bf4f7bfe857fb805894a04149b7f49e62a SHA-256: b7726a524d857f217c77a07c4023c6e3989341a63c64f7c10df63202cfe57bf5
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as information about exam results. The document also contains a large number of links to other PDFs hosted on various domains, likely part of a link farm to improve SEO for malicious content. No scripts were extracted, but the presence of the malicious redirector and the link farm 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.com/pify?keyword=marksheet+10th+class+2018+bihar+board
    • http://wavexo.nharrl.org/uploads/1/3/1/3/131383493/cfaf5513ec57.pdf
    • http://files.bookertchoir.com/uploads/1/3/0/8/130813827/4694802.pdf
    • http://files.spinningwheelclassiccars.com/uploads/1/3/1/0/131070317/3de56ef4d5d061.pdf
    • http://files.osolnikmachinery.com/uploads/1/3/1/3/131381919/fiwexifanemajazufo.pdf
    • http://files.graffcounseling.com/uploads/1/3/1/1/131164009/1789034.pdf
    • https://cdn.shopify.com/s/files/1/0463/6200/1563/files/nuseviruminid.pdf
    • https://cdn.shopify.com/s/files/1/0447/0718/4793/files/azagaia_abc_do_preconceito.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/6161021018.pdf
    • https://cdn.shopify.com/s/files/1/0448/0778/2557/files/free_lsat_logic_games.pdf
    • https://cdn.shopify.com/s/files/1/0434/0350/9914/files/news_intro_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/wodomujoxubumaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/timagamivubomakugotaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/cdc_influenza_vis.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/99223193406.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000682a.bin
8275b09b5a133a6e9ff2f98aa535480b7c86936ff25223154792f4e7955bef4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682A 5756 bytes
font_01_sfnt_off00007bb4.bin
d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB4 3720 bytes
font_02_sfnt_off00008718.bin
d924c1c9afd8879c808057dcac71b022334a8422ab4c19ef4a43bcafd39ee544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8718 11216 bytes
font_03_sfnt_off0000ac07.bin
2d3796d5e7fa54d5b0329c9eab59816985e6f9f139f02a7868686efd1f5ff09c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC07 7516 bytes

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