Malicious PDF — malware analysis report

Static analysis result for SHA-256 596a56da9c1592e0…

MALICIOUS

PDF

54.0 KB Created: 2020-08-05 07:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cac218fc6f708d9de3751ac11cea332 SHA-1: 7b6a1d64fc32a71c71e557ff9d9f2f9ec1575311 SHA-256: 596a56da9c1592e0bb27a1bde4b81e875be4dd718c24147c1e14495e76924b57
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a phishing lure, directing users to a malicious site via a link presented as a syllabus.

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.com/pify?keyword=allahabad+high+court+ro+aro+syllabus+pdf
    • http://files.jlmanzella.net/uploads/1/3/1/8/131871740/5afc793fcc.pdf
    • http://files.refinementproject.org/uploads/1/3/1/4/131410370/3541596.pdf
    • http://files.thesuitcasejunket.com/uploads/1/3/2/7/132740285/gujagumerevu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7132/3808/files/degijuduwusama.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/22169134540.pdf
    • https://cdn.shopify.com/s/files/1/0432/0509/9675/files/metufomokukajufolo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3917/6357/files/mivakedal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/zupimipubijiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/66527343717.pdf
    • https://cdn.shopify.com/s/files/1/0437/1451/1001/files/weather_channel_columbus_ga.pdf
    • https://cdn.shopify.com/s/files/1/0435/6866/0643/files/lemowurewo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9687/3885/files/88723455596.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/35851737716.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8683/files/data_structures_and_algorithms_with_javascript_o_reilly.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086c5.bin
382a5523b701c468b81897f41e47959a7b20e022e022c009a53f3b8251244897
pdf-font-stream PDF embedded font (sfnt) at offset 0x86C5 5648 bytes
font_01_sfnt_off000099f7.bin
0d12be3e71263a4950b45218c445d896379fb1397fb0d18303f2589c58b16fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x99F7 10248 bytes
font_02_sfnt_off0000bd11.bin
e46ee49772a907781091f009a09217d831ddbd8e1a4527b1892c711c2b446835
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD11 3516 bytes