Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d67cacab68e7921…

MALICIOUS

PDF

48.6 KB Created: 2020-08-09 08:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e75d176f19feef6d78b4ce3df3bf390d SHA-1: dee707beed73759122df5d7d52edc4486a9f5dc8 SHA-256: 8d67cacab68e7921f888226ea36c68d772aaed4bad27d943270dab98f6118301
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of external links, many of which lead to a redirector service. The primary malicious link identified is https://ttraff.cc/pify?keyword=activity+book+for+couples+pdf, which likely serves as a gateway to further malicious content. The ML classifier strongly indicated maliciousness, supporting the heuristic findings of a malicious redirector and link farm.

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=activity+book+for+couples+pdf
    • http://files.chicagomovietours.com/uploads/1/3/1/8/131871902/xesowonekari_pedozurik_nexikivulosiku.pdf
    • http://fixapek.southshoredanceacademy.com/uploads/1/3/0/9/130969723/jorez.pdf
    • http://files.saragayart.com/uploads/1/3/1/6/131607027/bc680fedb42810.pdf
    • http://rizid.virginiafilippousi.com/uploads/1/3/0/7/130740596/2619697.pdf
    • http://sibor.coastalvapers.com/uploads/1/3/2/6/132695278/mupojel.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/3216814499.pdf
    • https://cdn.shopify.com/s/files/1/0433/6015/7855/files/mudisidujasijop.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/92952859546.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/3._5_spell_compendium.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/rolaxapodireto.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/vomifosugigizugimejomin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/somusaxokedotodezut.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/57525692727.pdf
    • https://cdn.shopify.com/s/files/1/0436/2849/5001/files/sims_3_wii.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6774/files/87999464046.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/53959737965.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_off000067b7.bin
f4339c6a5aadffb05ce4a0fe6e02eba438855aaaea631ef002a2929932696b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B7 5292 bytes
font_01_sfnt_off000079dd.bin
5a1dc8ac36dfa32124d083fb375e130eabe603edb1d1e34e99765f74aaa6643b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DD 10704 bytes
font_02_sfnt_off00009e55.bin
ad8166871363f334e7d2f00e1c2ebc632478ef7d431cf4623f0b480e44802e8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E55 16692 bytes

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