Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c0d8e1ff219d34…

MALICIOUS

PDF

42.9 KB Created: 2020-08-23 14:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d05b057ad9ecea2472d70dcd999c14ae SHA-1: 5c2322f7a90b8955be9303187033d43bcb4f0f92 SHA-256: 51c0d8e1ff219d346f3c81d4985714e90617cec2e54cbbee3a3cb4e8e70d6950
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 malicious redirector at 'https://ttraff.cc/pify?keyword=appropriation+documents+of+contemporary+art+pdf'. The document body, though heavily obfuscated, contains text suggesting a lure related to art documents. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to malicious sites.

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=appropriation+documents+of+contemporary+art+pdf
    • http://nifuwulo.reneeyates2math.com/uploads/1/3/1/4/131438641/12d18126d8bd3.pdf
    • http://wajixalo.libratheater.org/uploads/1/3/2/6/132681947/6228170.pdf
    • http://files.practicalslighting.com/uploads/1/3/2/8/132815872/27279a5f10c67ad.pdf
    • http://files.newrockprepacademy.com/uploads/1/3/1/4/131454556/7343666.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9199/files/vuxolamoforonavawe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6094/files/33596562192.pdf
    • https://cdn.shopify.com/s/files/1/0435/1341/3786/files/95894397052.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/55211149076.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/acsm_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/lolikugomilakefak.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/cogentin_davis.pdf
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/51300385997.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/datopozud.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/lit_answers_alternative.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_off000068ec.bin
6c59092f93e130a4d43bca74f8b7fbc1d87a059e387ada27ed891dd51486a5ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 5360 bytes
font_01_sfnt_off00007b0e.bin
f148a7609890138a74308b6d427f087cdb8cb3f01ab4b90015bbc07966f23006
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0E 10428 bytes