Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16a6a855dd6b641…

MALICIOUS

PDF

117.4 KB Created: 2020-08-08 05:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e53f387615a18def6b093403e250a79 SHA-1: e13769387dd964eebb99bd58c6731bce4ccefdfe SHA-256: f16a6a855dd6b6412ff1a6e99c050059b18a2017073c71afae86531b18a309b2
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure the user to a malicious site.

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=el+capitalismo+tardio+pdf
    • http://bosos.elizabethclaretaylor.com/uploads/1/3/1/6/131637814/milofuxeg.pdf
    • http://files.visitkaunas.net/uploads/1/3/1/4/131438018/bapori_jojuxep_zoduxak_mowerabo.pdf
    • http://files.umcofmacedonia.org/uploads/1/3/1/1/131164016/9162366.pdf
    • http://files.andrewbattye.net/uploads/1/3/2/6/132695578/nirewu_mujive_bubugazo_birow.pdf
    • http://bebupiv.evernaturalphotos.com/uploads/1/3/2/6/132681513/2ff0d.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kuzizurogepibisomagin.pdf
    • https://cdn.shopify.com/s/files/1/0428/5104/1447/files/83339554738.pdf
    • https://cdn.shopify.com/s/files/1/0444/2678/9030/files/le_grand_livre_du_bouddhisme.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/9519920095.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/wemuzukegejatodos.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/41731619609.pdf
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/72521924366.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/latorokodezukofunoloxubi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70339383958.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9917/files/ncic_code_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/sizinavelaxobi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/kiwudifavakamu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/50143527816.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_off00018db5.bin
1a691008f8207ec44d055564666ba570a7c2af50375a69dbe334562447998fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18DB5 5256 bytes
font_01_sfnt_off00019f83.bin
c702c5f7107395aa502dc7f0c63819f5602df68073a849be1094596ed60e09b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F83 11984 bytes

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