Malicious PDF — malware analysis report

Static analysis result for SHA-256 781c5c48a3dff779…

MALICIOUS

PDF

62.4 KB Created: 2020-08-30 16:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e4c69d9247b9c93832fd62bfeda78b6 SHA-1: 3197942ed5b8d3a9167ce7c3dfffa387caaeb752 SHA-256: 781c5c48a3dff77927d985d8c2d4426101c4aaa7b6e139ef544e6e6622ad00b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Cornell soil health assessment training manual' and the malicious URL. The presence of a link farm and a critical heuristic firing for malicious redirector links strongly suggests an attempt to direct users to harmful content.

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/wix?keyword=cornell+soil+health+assessment+training+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_36ab2292abc746c7bd03bf81886881ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_992ee16689ec42778a78798ee7fe50aa.pdf
    • https://static.usrfiles.com/ugd/5926b4_41ee2bb9f5a94cd9a5f79e854840758c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb14eaa8021b4ea0883159d0c61abaf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf47ea6b1b8442ee9c2bcdc31cafbbe3.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/92450340371.pdf
    • https://cdn.shopify.com/s/files/1/0436/1024/3230/files/jizinu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/refanakomosorolaxirasix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3350/files/evaluating_exponential_functions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/how_much_does_a_taxi_cost.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2485/files/51367470120.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/91516183026.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/jio_caller_tune_number_app.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/73924173027.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rodol.pdf
    • https://cdn.shopify.com/s/files/1/0436/9920/8346/files/87616814410.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab5d.bin
9583da38adc8f41abc1b5d2f671e09162bfe0ae2d50a3869fd782f9e7200f135
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5D 5004 bytes
font_01_sfnt_off0000bc2e.bin
33aebf347c208522564a99df8972decc2b4613bd421325369752ae4bf7a91d65
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2E 15796 bytes