Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83e6a101bbc41b7…

MALICIOUS

PDF

43.0 KB Created: 2020-08-11 06:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d69999486672fd3d2f65608a3a71539 SHA-1: 9b5d0fd33e54fe1bb351ed2629537a96e0ebfe41 SHA-256: c83e6a101bbc41b7ce2622baa4969b08202ef5da722a3c091efc4e54b274946f
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a potentially harmful site. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to distribute further payloads.

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=accord+piano+jazz+pdf
    • http://wonape.belzbergdd.com/uploads/1/3/1/3/131383791/42828144cf5ad.pdf
    • http://files.victordelestre.com/uploads/1/3/1/4/131452838/fipirazuzoxiwupol.pdf
    • http://pifapi.nolimitzcardesignz.com/uploads/1/3/0/7/130775997/2632623.pdf
    • http://files.littleislandapothecary.com/uploads/1/3/0/7/130775633/ea316e301a.pdf
    • http://pubipipax.camelliacharlesjewelry.com/uploads/1/3/1/8/131871721/1659c6.pdf
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/48215342498.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/applications_of_calculus_to_biology_and_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0432/5572/6238/files/kidagafusefuro.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/75959212335.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4524/files/lesikabor.pdf
    • https://cdn.shopify.com/s/files/1/0428/4511/0438/files/11844768565.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/winexar.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/bank_of_baroda_internet_banking_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4127/files/25641430979.pdf
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/79007291364.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/naberolabagiduwejavipom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/fatugeriwusekedaxi.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_off000068a5.bin
1372c4d3869faa360b48411293e1a6e18d8a801baaf250ecdf0f2a2d056d599b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A5 5056 bytes
font_01_sfnt_off000079ee.bin
da9dcbc5b44fadb8f371b42eb091faf2a238ab1c297e7eeac50745a0a45be430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EE 11128 bytes

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