Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1477b2a8991e2c…

MALICIOUS

PDF

54.1 KB Created: 2020-08-14 11:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d39c0c38e8442a194041ebe2b550b520 SHA-1: db507c61659c0fc0a5767ef12b7c7b4b9ed1bef3 SHA-256: 9c1477b2a8991e2ca2798ba8f0dd5e7d4b2d9d6e2364563512e918fab77b17da
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, ttraff.ru, disguised as a 'Palmistry guide book'. The document body, though heavily obfuscated, contains the URL and appears to be a lure. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or content-spinning technique to improve search engine visibility for malicious content. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=palmistry+guide+book
    • http://files.coreyrobinsonmusic.com/uploads/1/3/0/7/130776822/396689.pdf
    • http://xepali.olivinthelife.com/uploads/1/3/0/8/130874493/raxasejizageziwawidu.pdf
    • http://tifixi.crystalfh.com/uploads/1/3/0/7/130776485/vobapamol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/39460240637.pdf
    • https://cdn.shopify.com/s/files/1/0428/0995/0367/files/zemarito.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57032902602.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/72939497218.pdf
    • https://cdn.shopify.com/s/files/1/0440/0473/7174/files/40490485344.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/panasonic_fan_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0448/files/gunabarulimigesosok.pdf
    • https://cdn.shopify.com/s/files/1/0437/6693/9799/files/26530968808.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/advanced_vlookup_excel_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/yennai_arindhaal_movie.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2270/files/kipegumugugixa.pdf
    • https://cdn.shopify.com/s/files/1/0454/0645/3928/files/causal_inference_in_statistics_a_primer_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7742/5565/files/barras_energeticas_de_kiwicha.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/
    • https://cdn.shopify.com/s/files/1/0428/0995/0367/files/zem

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092af.bin
b1c61d77e4889e13b77c329ea382ad7414cfd7b13d50552a63afb71be84a4b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AF 5452 bytes
font_01_sfnt_off0000a51f.bin
5da412117c5661031228ed54af754f3b53dd1bc6319bce253f2e05063ebc656d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA51F 11184 bytes

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