Malicious PDF — malware analysis report

Static analysis result for SHA-256 9402fc10498eb930…

MALICIOUS

PDF

48.4 KB Created: 2020-08-13 23:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 233339c55660189cbdc5d0aba144f306 SHA-1: a79c76eda7320bb3a81e7b63f8a2592f0a25771c SHA-256: 9402fc10498eb930bad03d92417dd9d76639f2c0ff32e54854caecea92e0978d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=android+10+xiaomi+a2`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to 'android 10 xiaomi a2', suggesting a lure for potentially malicious content.

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=android+10+xiaomi+a2
    • http://lubiradu.theislandernewspaper.com/uploads/1/3/1/8/131856271/woliremesakoput.pdf
    • http://gerun.twcnpc.com/uploads/1/3/0/8/130814328/volijaru.pdf
    • http://mevozela.livelyimpact.com/uploads/1/3/0/9/130969060/b91c76d58b8ad.pdf
    • http://files.ourhiddenhills.ca/uploads/1/3/0/8/130874284/luzuxabulu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/4168012961.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/99343698282.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/western_union_receipt.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2156/files/accountancy_notes_class_11_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/54286110104.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/car_diesel_engine_parts.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/simuraraguliz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/caracteristicas_del_materialismo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/kutegavuraxuxa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/30528963140.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/vuvilibebeku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33078626275.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e88.bin
064b6e039e610c01bd6a62ce943453bbe90900736b748abf51e34535a776dc48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E88 5144 bytes
font_01_sfnt_off00006feb.bin
1d739be46a300e0470098b03cb3525ce218fda25c712b9663aaff7a7ecef4354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEB 2108 bytes
font_02_sfnt_off000079b9.bin
577d488160a2ec9e56a2ec2bc1db150d0d4f3baa1c9bbabc53e5a52753b59b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B9 10420 bytes
font_03_sfnt_off00009d90.bin
15def471f222bdc4c1830d356d4fd1f0206e3a84408f81709b6ccab1dca1ef47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D90 16728 bytes

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