Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1b859274bdc88d…

MALICIOUS

PDF

39.8 KB Created: 2020-08-10 09:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f6b46b4d9311d8b8650e2d50077ecc8 SHA-1: 0abf8fc5cdd98c0af4fd15f4fdb80fe55343946d SHA-256: 8c1b859274bdc88dc324ba768f284638d6a3c6b3b73a0b7bd2ee1568c00aadb0
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text that appears to be a lure for a specific PDF document, and the embedded URLs likely lead to further malicious content or phishing pages. The primary attack pattern involves luring the user to click on these links, which then redirect to malicious infrastructure.

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=social+and+personality+development+david+r+shaffer+pdf
    • http://files.rbigroup.biz/uploads/1/3/0/7/130739713/felovoforinalave.pdf
    • http://patuvo.johnsalozzoart.com/uploads/1/3/0/8/130874493/223ac10c8b68.pdf
    • http://files.gibsonspropertyservices.co.uk/uploads/1/3/1/4/131437056/8641738.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0437/9279/3757/files/carburetor_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/beps_action_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2231/files/68123637256.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/novirepikegez.pdf
    • https://cdn.shopify.com/s/files/1/0431/0951/5425/files/blast_furnace_process_control.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6641/files/midafimejofanarusi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/affiliate_marketing_business_model.pdf
    • https://cdn.shopify.com/s/files/1/0428/2944/7335/files/66656275124.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/duxemebetidixew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8303/8874/files/kawexegalifavokufofuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0829/files/27437283508.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_off00004f96.bin
906cef4c4f2ff9751dae64f9e656af20c39cd469f392c2e33a06fc8cf93b899d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F96 5448 bytes
font_01_sfnt_off000061e5.bin
4bd707b823c828d7b51d9418edacbd09e80053a16c0a0f824c548f27d2a4128a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E5 9860 bytes
font_02_sfnt_off00008358.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8358 4324 bytes

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