Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa7cf0940da6494…

MALICIOUS

PDF

41.7 KB Created: 2020-08-01 13:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd2a152179b2aa859c4c65eee8e6cb35 SHA-1: 127fb7b8c1485a3ad7f69a2543502ac5bd449da6 SHA-256: cfa7cf0940da64944819f9e14a0cdc65e4e95b9124920e6bd689a7023fc4cd42
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with a critical heuristic firing for a PDF link farm. One of the primary URLs, 'https://ttraff.cc/pify?keyword=circle+with+transparent+background', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify domains, suggesting a lure to external, potentially malicious, content. No scripts were extracted from this sample.

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=circle+with+transparent+background
    • http://files.shineeventdesign.com/uploads/1/3/1/4/131406413/sexupisiko.pdf
    • http://files.khristofflee.com/uploads/1/3/2/6/132696154/bawifebuz.pdf
    • http://files.laflorentinehoa.com/uploads/1/3/1/3/131383954/34f222e.pdf
    • http://files.ljkplumbingandheating.co.uk/uploads/1/3/1/3/131397946/peduxaxunolota_bovufedutimotav_bawejufud_juzepedibena.pdf
    • http://files.whereisthebrightline.com/uploads/1/3/1/4/131453592/gevegeni.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/pamuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/dusozefumamejota.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/57976386571.pdf
    • https://cdn.shopify.com/s/files/1/0431/9484/3298/files/logobezerolax.pdf
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/scorn_of_the_intangir.pdf
    • https://cdn.shopify.com/s/files/1/0441/2515/9576/files/fadanegog.pdf
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/44468432925.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/kefivebovajajoziwuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7032/files/tinhte_tai_phan_mem_in.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8573/files/57704811710.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_off00005bd4.bin
ea3bb2067703923eba84bbe38b8dc1ec9e7d3c00982ac1d8567bd0e3185256f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD4 5536 bytes
font_01_sfnt_off00006e9d.bin
0810ce0371bb48a6dbbb6c56d423a1e4bda4455f4638deeed9c91ec23a796c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9D 1728 bytes
font_02_sfnt_off00007735.bin
e86af12a0255fda319041d5871141bf5ac431d52163c97216323fd1f9f47160a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7735 10072 bytes

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