Malicious PDF — malware analysis report

Static analysis result for SHA-256 401833b2ac715dbd…

MALICIOUS

PDF

41.4 KB Created: 2020-08-07 00:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c66061d8ee8761bd6b3f05ebbcd62451 SHA-1: 13fd2c402504fe1cd422c8a851c05273fda1601b SHA-256: 401833b2ac715dbddeaaddd378ccb7f22a20da2df0b33ea4fbad0937d8438f9d
152 Risk Score

Malware Insights

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

The PDF contains a deceptive document body referencing 'bstc result 2020 name wise pdf' and numerous embedded links. A critical heuristic identified a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=bstc+result+2020+name+wise+pdf', indicating an attempt to lead the user to malicious infrastructure. The presence of a large PDF link farm, with many links pointing to benign Shopify domains but one critical redirector, suggests a social engineering tactic to obscure the malicious destination.

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=bstc+result+2020+name+wise+pdf
    • http://saralakaz.bluepansycottage.com/uploads/1/3/0/8/130874284/fufefitadebowobefuk.pdf
    • http://files.pridefightingchampionshipstribute.com/uploads/1/3/0/8/130814235/f67774d2690a.pdf
    • http://files.refacemasters.com/uploads/1/3/1/3/131383323/kunadeka-xesil-fokap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/government_budgeting_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/fevute.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6241/files/19374619642.pdf
    • https://cdn.shopify.com/s/files/1/0428/7453/6103/files/wimititudaludor.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/zamozoloruzeji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/65078919748.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2070/files/vonuvumopitit.pdf
    • https://cdn.shopify.com/s/files/1/0448/0391/5933/files/the_barefoot_investor_five_steps_to_financial_freedom.pdf
    • https://cdn.shopify.com/s/files/1/0428/8738/1155/files/gamimuvunen.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/python_print_2_decimal_places.pdf
    • https://cdn.shopify.com/s/files/1/0430/0354/3715/files/22203734671.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_off00006380.bin
cf77103916a653b73cc170ca7d01dab76b80016b0a33a10cd77aad2d632186f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6380 5716 bytes
font_01_sfnt_off000076ed.bin
86808312683f99ec6a5a80ac201508cbd71a0cca306d3713449725862549451f
pdf-font-stream PDF embedded font (sfnt) at offset 0x76ED 10012 bytes