Malicious PDF — malware analysis report

Static analysis result for SHA-256 850f4e171c601659…

MALICIOUS

PDF

60.1 KB Created: 2020-08-24 02:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd542b6614758800275f30ed0255c704 SHA-1: 3987b61226a3daf579de55e4a8da724d5ee5bc24 SHA-256: 850f4e171c601659eb62d52e0b231e1989bfafce8e8d6258d82204fccd6dd4b5
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=benefits+of+material+requirement+planning+pdf'. This suggests the document is designed to redirect users to malicious sites. The presence of many links to Shopify domains, some of which are benign, indicates a link farm strategy to improve SEO for malicious content. The ML classifier also 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=benefits+of+material+requirement+planning+pdf
    • http://files.micdropdj.com/uploads/1/3/1/4/131407818/fufivosavaje_bidepidirizit.pdf
    • http://files.americancollectorsusa.com/uploads/1/3/1/0/131070646/betagosifurok-tifovuwikelir-tanubix.pdf
    • http://files.sineadwhite.com/uploads/1/3/2/6/132682585/mekix.pdf
    • http://seziti.bprising.com/uploads/1/3/1/3/131398027/fuxovib.pdf
    • https://cdn.shopify.com/s/files/1/0435/6970/9217/files/brookstone_bluetooth_earbuds_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/9560/3862/files/ligne_11_aix_en_bus.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/fefuzewopuwuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7505/files/sizibigus.pdf
    • https://cdn.shopify.com/s/files/1/0432/3373/8911/files/14977445710.pdf
    • https://cdn.shopify.com/s/files/1/0429/1585/6550/files/79974909467.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/fulinupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/milliseconds_to_second.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/berio_folk_songs.pdf
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/19250676283.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_off0000acee.bin
f1c22c4487bf2a67d25844886deada689e002f5b032f79a8c35951af837577fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xACEE 5536 bytes
font_01_sfnt_off0000bfa1.bin
c073859f4894fde55448d76c1d5dd9ca4c076e861f193d0c6901d046ba7efd26
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA1 10448 bytes