Malicious PDF — malware analysis report

Static analysis result for SHA-256 8216fb1b40d5c3b3…

MALICIOUS

PDF

40.5 KB Created: 2020-08-21 16:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b566b57cc34d218948b5bdd2afa472b0 SHA-1: 744754889455b55df91492bfbafe0bf582668bf6 SHA-256: 8216fb1b40d5c3b37e83269ab82394e8ce26344c8df59eddaaa082917f5dacbe
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Michael Kors shoes size guide' and the malicious URL, suggesting a phishing lure. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm designed to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=michael+kors+shoes+size+guide
    • http://files.devotedtotheking.org/uploads/1/3/0/8/130874588/jizeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/vemetuvelonurixenikitor.pdf
    • https://cdn.shopify.com/s/files/1/0452/5296/8605/files/33450308227.pdf
    • https://cdn.shopify.com/s/files/1/0430/9899/6889/files/77729827350.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/bafg_anlage_1_formblatt_1_ausdrucken.pdf
    • https://cdn.shopify.com/s/files/1/0430/1497/9737/files/90833101212.pdf
    • https://cdn.shopify.com/s/files/1/0438/5252/9829/files/zeliz.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/15891259229.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/77197382541.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/lumberjack_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0436/9701/2890/files/6997882364.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_off000056f9.bin
f061883d01f0f17c0fb675275b2145699e96c1282b0ca31ff8784df8ee240173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56F9 5320 bytes
font_01_sfnt_off0000690e.bin
4c34c2e7be7650a5b64838125aee45bf24e28d1d873a9f198e567359bb01c882		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690E 14512 bytes

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