Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3d8eeeb212bb96…

MALICIOUS

PDF

38.1 KB Created: 2020-08-17 12:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42af1ed691d06d2c5bc5502c32954d84 SHA-1: ba8d7ff4c7157d50fd430505c5f9b0f63b106ee9 SHA-256: 6b3d8eeeb212bb9655a01bce5f18c9f86806ffb1390ca40be53dd38026f89c14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links pointing to a known malicious redirector, indicating an attempt to lead the user to harmful content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to disguise malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=beneficial+ownership+certification+form+fincen
    • http://bubenag.devonbatemusic.com/uploads/1/3/0/7/130738993/sodomagolijine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/51311616838.pdf
    • https://cdn.shopify.com/s/files/1/0439/2330/8712/files/wowifomageguzujepud.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/kinewapoxaxotepu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5815/7982/files/classification_of_anticancer_drugs_with_mechanism_of_action.pdf
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/polozikoxuva.pdf
    • https://cdn.shopify.com/s/files/1/0434/2130/2946/files/tenaridukakumafipu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41267837863.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/jabaxowa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005778.bin
c5fba0f17b47f1dc686761436619bd9f82d1b61589c505519bf85ff0508490b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5778 5396 bytes
font_01_sfnt_off000069b6.bin
8469a03a324752cc5eeb3a75823fd7f40b3c58a280fa82a66ef714152e3551c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B6 10028 bytes

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