Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0174676a1de0b7…

MALICIOUS

PDF

37.7 KB Created: 2020-08-23 21:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd01b539aef2cbe40545e50a055e1f2 SHA-1: ee91177731fa8a5cc840c279e6fd2f4d1c1d0533 SHA-256: da0174676a1de0b775c5ec228433bf05f4bef380283e095b64793578e9799fbd
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm, indicating a likely SEO manipulation or phishing attempt. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which is likely intended to lead 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.ru/pify?keyword=skechers+performance+logo+vector
    • http://files.texasphilosophy.org/uploads/1/3/1/3/131398479/ninuve-vasevu.pdf
    • http://biniter.rtemusic.org/uploads/1/3/1/3/131383483/4095581.pdf
    • http://files.dlsu-soe.com/uploads/1/3/0/7/130740213/forulabutozo_kuxomazosego_moluga_wobalopafe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/53321635587.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9617/files/wovimekuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/62764178152.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/mozajiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/5085478306.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/wisawubapolizilozu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/lakitepasurag.pdf
    • https://cdn.shopify.com/s/files/1/0429/3145/4119/files/meaning_of_economic_environment.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1085/files/19163030617.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_off00004690.bin
e621f3428215731fe4485bde95120900a76c175e1aaedf037db2f9554d91267c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4690 5656 bytes
font_01_sfnt_off000059ad.bin
afff86aae4b9440133873a8b6f3ab89076101602c80b756700acfa57cd3a025a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59AD 15372 bytes

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