Malicious PDF — malware analysis report

Static analysis result for SHA-256 6137f1ca49f7fb92…

MALICIOUS

PDF

40.8 KB Created: 2020-08-02 07:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32846c7b83c96c906d0511ecf828415d SHA-1: 5e13dbc2a916f4cb66cffb4463dfa3fef42398bb SHA-256: 6137f1ca49f7fb9295f3ff883758a90b1cf8a3197dcbbbeac7733aa8f85a7a2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious content farms. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm or redirection scheme.

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=pdf+google+viewer
    • http://files.en.bio-mas.org/uploads/1/3/2/7/132711961/dd97a313e.pdf
    • http://files.doggiestylezinc.com/uploads/1/3/1/3/131384663/6210112.pdf
    • http://files.620chilinights.com/uploads/1/3/1/6/131606121/zukadak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4933/7500/files/14123376329.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/magnimar_city_of_monuments.pdf
    • https://cdn.shopify.com/s/files/1/0430/2841/4618/files/tidokisabeninidigubakepeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/4633/0791/files/sibilapugebonuwiliwujined.pdf
    • https://cdn.shopify.com/s/files/1/0436/8180/8549/files/giropuratakuxoruzo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/35931881709.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/smallville_full_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5079/files/10512213709.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6034/files/revosivege.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/lasaxemof.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/24781508801.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_off00006335.bin
7cd24aaaf9ce931b16073bb16840b1e277bdb36b4ded78d14452921625589d81
pdf-font-stream PDF embedded font (sfnt) at offset 0x6335 4840 bytes
font_01_sfnt_off000073d1.bin
b23f028ba95326a68dfc59e3c363451eccaf215724dc80e3bdeb3d64b89c9920
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D1 10176 bytes