Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cd08667b31d8bb…

MALICIOUS

PDF

46.2 KB Created: 2020-08-14 08:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e922ce033b6ed0072393ad00d3c5dd SHA-1: 08b3a96f9788e5f7edc49d81d1870ce9d5fbfbff SHA-256: 56cd08667b31d8bb011d4247517fb270b409a93e3de17cbbe35d0d0a66ee309a
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'foreclosure guidelines' and embeds numerous external PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be tricking the user into clicking the malicious redirector URL.

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.ru/pify?keyword=buying+a+freddie+mac+foreclosure+guidelines
    • http://files.phillipsburglutheran.com/uploads/1/3/1/4/131437457/233801.pdf
    • http://sidumije.silverfernevents.com/uploads/1/3/1/4/131454065/4129730.pdf
    • http://files.creatingthespaces.ca/uploads/1/3/1/6/131637362/nodibagifalabetabag.pdf
    • http://files.nbbnbdp.org/uploads/1/3/1/4/131453817/bufowajatemugok.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/fakinibofemibedapepado.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/nulisitipidukotu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/poxisulexulaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/matugezaxidun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96056065099.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/19729917445.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/mazalodilofolajuwuzomisam.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/giwoxizosedubelofugun.pdf
    • https://cdn.shopify.com/s/files/1/0445/3341/6095/files/abbott_magic_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/mubofudori.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_off000074d9.bin
c4a64bf7d1a7ad29eb02112eaf93da21d6f23cc9fff197b6001b3476fce72e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D9 5492 bytes
font_01_sfnt_off00008775.bin
ba053ca6050aecdfd7dd7dabc8291f07111975404a972a1a64a76ee13981c371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8775 10028 bytes

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