Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c159ab96499a260…

MALICIOUS

PDF

38.9 KB Created: 2020-08-22 21:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29d266234a47ceb0bb42b9260361c951 SHA-1: 7b87b6b34de72bd4c3a435a925ff8597050182cb SHA-256: 2c159ab96499a2602225632ce65350eca3bd7e9124f363a858ba5d1e9a24d955
154 Risk Score

Malware Insights

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

The PDF contains a lure for a Halloween crossword puzzle worksheet, which is a common social engineering tactic. It embeds numerous links, including a critical redirector link to 'ttraff.cc', indicating an attempt to lead the user to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document body and embedded links are sufficient to infer the attack pattern.

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=halloween+crossword+puzzle+worksheet
    • http://files.prompt.ca/uploads/1/3/2/7/132740716/bifoxulukenenipanes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/css_tournament_brackets.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/wepumimibipuzuriruwesased.pdf
    • https://cdn.shopify.com/s/files/1/0447/6112/0919/files/1_1_domain.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3529/files/75724174573.pdf
    • https://cdn.shopify.com/s/files/1/0431/4572/4055/files/2018_daily_calendar_template_excel.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/30875048597.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/cloud_atlas_sextet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/20092964432.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_off00005aa7.bin
2b183003894e84fd066cd445f017c2a3c427988e7c6f15be0f4b91d07f36486a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA7 5328 bytes
font_01_sfnt_off00006cd3.bin
3808276ed1d273d100ddac972b79bbda10ef32fca4020abf8a4ad821322d4a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD3 10024 bytes

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