Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1081bde84288a54…

MALICIOUS

PDF

42.0 KB Created: 2020-08-16 20:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcd7fe929ecffe55ba05acfb1e809cdd SHA-1: 2a5ccb05ab47fadfc7416f5a53740db2dbd2bc25 SHA-256: a1081bde84288a543fd879c550af267c29e8d62fea219b9a949d9d8b51505318
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'Benedict's world tour rs3 quick guide', suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector indicates an attempt to lead the user to a harmful destination.

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=benedict%2527+s+world+tour+rs3+quick+guide
    • http://nurugi.davewatkinsmusic.com/uploads/1/3/0/7/130740596/takatigobidor-najuxipoval-nuvotuj-rolasu.pdf
    • http://files.mkdmusictunes.com/uploads/1/3/2/6/132682745/powamomiwipepaxu.pdf
    • http://files.ashengroundcc.org/uploads/1/3/0/7/130776370/a224fe1fa3.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/java_exception_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/3155/1400/files/expanding_tactics_for_listening_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2005/files/balancing_act_practice_t_trimpe_2006_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7096/files/kenefeseg.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/56121229080.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/jaduzoxoginexiwasapazasi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4071/files/movesadipibozokovenanup.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/62568138989.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/taviwapo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5941/1094/files/15227464220.pdf
    • https://cdn.shopify.com/s/files/1/0440/8855/7718/files/new_god_flow_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/5482/5621/files/learn_german_fast_and_easy.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_off00006553.bin
f6190a1ae9583379d0842ac1720bac73adc7dad1ca8722c0bf7fc419140899b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6553 5424 bytes
font_01_sfnt_off000077ec.bin
11b01410a61b9a497eb6738d427de6afb82bfdff072e34f5265ec3ff68f06fd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x77EC 10304 bytes