Malicious PDF — malware analysis report

Static analysis result for SHA-256 245030698a33f243…

MALICIOUS

PDF

40.3 KB Created: 2020-08-25 01:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f9422c330a4a391581387d87897f7c2 SHA-1: de42c548f33bb3e1261150f0edcb4512eb129f07 SHA-256: 245030698a33f2432a244010d4d91c0b5024bd431188d98c1b32a89af88e4be1
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at https://ttraff.cc/pify?keyword=nice+guidelines+crohn%2527+s+disease+treatment. The document body, though partially obfuscated, also contains this URL and other links to PDF files hosted on various domains, suggesting a link farm or redirection strategy. The ML classifier strongly supports the malicious nature of this PDF.

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=nice+guidelines+crohn%2527+s+disease+treatment
    • http://files.achieveprovideo.com/uploads/1/3/0/8/130814754/db3eae0eaad.pdf
    • http://garoduf.sizzlegrills.co.uk/uploads/1/3/0/8/130874232/tolixudawugufexu.pdf
    • http://files.jashancatering.com/uploads/1/3/0/7/130776735/lepisobanijukal-sevotol-dubuxekavab-watazipemozu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/social_studies_culture_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3928/files/43671268304.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/adobe_printer_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0447/9247/9901/files/residential_tenancy_branch_bc_condition_inspection_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/8215/3112/files/41402358422.pdf
    • https://cdn.shopify.com/s/files/1/0436/1748/4957/files/bionic_arm_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7781/files/integer_to_string.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/pixuworuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/turovuzogiripedovibutowa.pdf
    • https://cdn.shopify.com/s/files/1/0446/7671/0563/files/huttodyake_sayodyake_full_song.pdf
    • https://cdn.shopify.com/s/files/1/0464/7256/0790/files/free_blackjack_games_for_fun_no.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_off00005fe4.bin
1bc7ccad77b604f98fad82c84bc420f7ff8606cd0f9588bda27c61f4eec5b8c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE4 5356 bytes
font_01_sfnt_off000071ec.bin
a4150a144dba0ebdf1b9d7c4ebb3b8a4840eaa9ac16d5c09b3f8bdc28b7a321f
pdf-font-stream PDF embedded font (sfnt) at offset 0x71EC 10048 bytes