Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0b8b3845db86d9…

MALICIOUS

PDF

62.8 KB Created: 2020-08-09 01:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e5e3184404eff649b8e4f89145a3373 SHA-1: 1303cbc369721918334546ed1d7c7ac7771f7643 SHA-256: 8e0b8b3845db86d939b47bd0de99b90df87d457cad6aa75afa285499448e3bb2
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, with one identified as a known malicious redirector. The document body, though partially corrupted, contains text related to 'oscillometric method of blood pressure measurement pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious link farm. The primary malicious activity observed is the redirection to potentially harmful content via the ttraff.com domain.

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=oscillometric+method+of+blood+pressure+measurement+pdf
    • http://files.adultdaycenter.org/uploads/1/3/1/1/131163879/3329193.pdf
    • http://files.indianawatershedinitiative.com/uploads/1/3/0/7/130776611/5902327.pdf
    • http://files.clantonplainsbc.org/uploads/1/3/0/7/130775229/podel_wofoxedufiwu_mebiv_fosevesopabodos.pdf
    • https://cdn.shopify.com/s/files/1/0437/9423/5553/files/lm7805_voltage_regulator_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/wikalogowuvebijozeniti.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/53767457240.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3728/files/capitalism_without_capital_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/59374551482.pdf
    • https://cdn.shopify.com/s/files/1/0433/3066/6651/files/adobe_photoshop_cs5_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/69525540547.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/32935951772.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/18766914281.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/moromixizusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/naxupironizizi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a928.bin
4ed78eb75392757bfae096fd88ff770c02d14df46caff66363d98d08d22bf455		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA928 5444 bytes
font_01_sfnt_off0000bb6b.bin
a84f7571afb9fe2c98976e1b91e34d92aba8168973428f0e6e05fd96e298d67d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6B 10616 bytes
font_02_sfnt_off0000dfa2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 4324 bytes

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