Malicious PDF — malware analysis report

Static analysis result for SHA-256 519186be0b3ae141…

MALICIOUS

PDF

42.7 KB Created: 2020-08-13 16:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 172417025ad1ac85dd77cb1ae24fdd94 SHA-1: 39f2230ac976c54c3f54a8197c31da74f33d86fa SHA-256: 519186be0b3ae1416c920079e9e2de80c02f3f6a8b24738c9b40f8c114a2123f
152 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which, 'https://ttraff.ru/wb?keyword=phenobarbital%20poisoning%20pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and references 'phenobarbital poisoning', suggesting a lure to a malicious site. The presence of numerous other links hosted on cdn.shopify.com, while individually benign, contributes to a link farm pattern. The ML classifier strongly indicates 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/wb?keyword=phenobarbital%20poisoning%20pdf
    • http://siledevet.tbsfamily.org/uploads/1/3/1/0/131070872/xesuwamuvixodike.pdf
    • http://files.aerialrootsstudio.net/uploads/1/3/0/8/130873830/lilitaporatisutet.pdf
    • http://files.xoxoperformance.org/uploads/1/3/1/4/131452976/totalimugujedetudu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jamitaribigonekadori.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9335/files/sejavetofomazizezewalugit.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/56066725494.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/gemafej.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/1364466924.pdf
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/cathode_ray_tube_parts_and_functions.pdf
    • https://cdn.shopify.com/s/files/1/0434/3139/5493/files/zenogogisejawubelozitar.pdf
    • https://cdn.shopify.com/s/files/1/0450/2175/7590/files/jurnal_keperawatan_hernia_inguinalis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/tudojifalasisuvuzo.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_off000065df.bin
4b0d3a9276f889c6106d6ffa733d920d8c59591b9610d067305d3fd0a3e4501f
pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 5444 bytes
font_01_sfnt_off0000784b.bin
1ce899c2a38b7656b95595abe8a8a83dd560bf72c4ee96215b36d931e2f75e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x784B 11064 bytes