Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1723c79e001afe7…

MALICIOUS

PDF

48.6 KB Created: 2020-07-31 17:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d61608fb2b2156ff2eb9150499ad7a95 SHA-1: cdc3105ed1cc1480cc34e7893c11716227d6a240 SHA-256: e1723c79e001afe7163f5815169f7a1564bf9016ee4285c8e2263411655cc2dc
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files hosted on Shopify domains, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=acrobat+dc+pdf+browser+plug+in'. The document body text, though partially corrupted, contains keywords related to Acrobat and plugins, reinforcing the lure. The ML classifier strongly indicated maliciousness.

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.ru/pify?keyword=acrobat+dc+pdf+browser+plug+in
    • http://files.d-ark.info/uploads/1/3/1/4/131438419/rebudarurorezud.pdf
    • http://files.pragatipathik.org/uploads/1/3/1/6/131637014/bb91b242a43.pdf
    • http://files.lonestarcamp.org/uploads/1/3/1/6/131608016/fezagetebifibag_moduzeripuxuj.pdf
    • http://files.bbhames.com/uploads/1/3/0/8/130874676/7541741.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/22675068169.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/27733194310.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/32966460010.pdf
    • https://cdn.shopify.com/s/files/1/0435/8343/9003/files/18774112067.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/64801475096.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/22527066849.pdf
    • https://cdn.shopify.com/s/files/1/0429/3433/7695/files/nujuxu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5033/4368/files/jizaxes.pdf
    • https://cdn.shopify.com/s/files/1/0440/5238/1846/files/rolawoniv.pdf
    • https://cdn.shopify.com/s/files/1/0438/0996/4192/files/55362877218.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/finedovidenasepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/powojezezabowiteguv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/19774909122.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_off00008093.bin
42baec56506a47bcd2ad2cab85d38ad9e78349c46bb8affc6e4095451e1098dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8093 5544 bytes
font_01_sfnt_off0000938c.bin
a35b7a9a5cbb95175a2327cc760b9b18bf5aa3f05172c6902f99bea82b785939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x938C 9904 bytes

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