Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7cba78dd0f748f…

MALICIOUS

PDF

50.6 KB Created: 2020-08-06 19:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2691955a1f4e63542edb2e5c44803f5 SHA-1: 38fe78f05a67d7f678975c83d2c012f902b2910a SHA-256: ee7cba78dd0f748f306c9861113738c011194ae415365e2fcc50abc9de34ddc5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, includes the same URL and references 'Cedulas do brasil 1833 a 2020 pdf', suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=cedulas+do+brasil+1833+a+2020+pdf
    • http://files.reyal.co.uk/uploads/1/3/2/6/132695384/kajijirelinu_pebunuv.pdf
    • http://files.ohioscl.org/uploads/1/3/0/8/130873771/jiwulabukitetijimigu.pdf
    • http://files.placercountyreviewagency.com/uploads/1/3/2/6/132695200/3022409.pdf
    • http://rapuki.ausmazehanatkhan.com/uploads/1/3/1/6/131606407/bevibasojukamom.pdf
    • http://files.goldenpandarestaurant.com/uploads/1/3/1/0/131070030/deteduwiwagoxize.pdf
    • https://cdn.shopify.com/s/files/1/0437/5969/8077/files/gabigurawomowusilo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6857/8210/files/7078748309.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/steam_download_stuck_on_stopping.pdf
    • https://cdn.shopify.com/s/files/1/0431/8301/4048/files/71133869012.pdf
    • https://cdn.shopify.com/s/files/1/0435/1728/0408/files/82078499169.pdf
    • https://cdn.shopify.com/s/files/1/0437/8073/5138/files/ave_maria_gounod_soprano.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/97296892881.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/2686353457.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/cambridge_essential_english_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/1839/3499/files/pikufuzafefubozin.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_off00006bc8.bin
37a688375b4c69a29a0ad1f873b20f16a166ae2df03697cb2499a00e592ac7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC8 5580 bytes
font_01_sfnt_off00007ecb.bin
4844fb92ac07c94235f9ac3f469dedd96bfdac01e03d5943576934fc307c4d3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECB 15048 bytes
font_02_sfnt_off0000acf9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACF9 4324 bytes

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