Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edfebcc389e2b00…

MALICIOUS

PDF

71.6 KB Created: 2020-08-22 22:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 261b290f91f87bbd98564950219f7ad5 SHA-1: ffca071b2e7e00cc46403c8a9aaa4efe472a04f9 SHA-256: 7edfebcc389e2b00d7144803c2e90ef25840324390bc76ea5294e97385863121
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'baseball practice plan template word' and a URL pointing to a redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring users to malicious sites via embedded links.

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=baseball+practice+plan+template+word
    • http://files.madysonkennedy.com/uploads/1/3/2/3/132303286/sunumite.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/aberration_of_light.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/42668764242.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/prey_neuromod_fabrication.pdf
    • https://cdn.shopify.com/s/files/1/0432/7823/7856/files/word_formation_processes_folk_etymology_examples.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/alarm_clock_app_for_android_tablet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/south_lake_union_trolley.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/ouran_highschool_host_club_live_action.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/saber_pedagogico_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/commercial_lawn_care_contract.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e4.bin
9c734b54bf611b8442713f33b31ff944d1ff9e9da147c78084373210b2133b32
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E4 5288 bytes
font_01_sfnt_off0000d4c2.bin
9f8e6e2d204c006e54a0527ac474a68fed18b0144cdcd32baa0286b51901d435
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 15252 bytes
font_02_sfnt_off000103f8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 4324 bytes