Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d90e9d478e75a78…

MALICIOUS

PDF

40.4 KB Created: 2020-08-21 23:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff3770e80fb5728161239c44dec9ee6 SHA-1: c212f31f35f566fe4aa0ba2aa01976945e49251a SHA-256: 8d90e9d478e75a786b2c38e29f3c7bc323b87bdd5ea998b081d8df02d1ebaef0
152 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 'ttraff.com'. Additionally, it hosts a large number of external PDF links, many hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the lure.

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=marriage+status+video+tamil
    • http://files.ddssullivan.com/uploads/1/3/1/3/131383333/814cf0df42.pdf
    • https://cdn.shopify.com/s/files/1/0433/5540/6494/files/74859059585.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/wemeginuzogopinovepozazum.pdf
    • https://cdn.shopify.com/s/files/1/0434/5239/9777/files/punaduzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1559/files/16884146312.pdf
    • https://cdn.shopify.com/s/files/1/0436/1689/5133/files/malayalam_catholic_bible_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9993/8211/files/south_america_map_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35022180152.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/javascript_check_if_object_is_empty.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8661/files/40885846873.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/kathi_villain_bgm_ringtones.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/deuteronomy_bible_quiz_questions_and_answers_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16481260084.pdf
    • https://cdn.shopify.com/s/files/1/0463/4912/3741/files/sotibalaronokagozorawam.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/40735845594.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_off000056fb.bin
8e079d219a58f34ebb14ee67764d4df1da6d9208a4826626c588b7e6dd934a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56FB 4988 bytes
font_01_sfnt_off000067ff.bin
dfc953039a2ed6258e164971b33a168f9f7a6845fd4513cf50b56e9fb17d9fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FF 9012 bytes
font_02_sfnt_off000086e3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E3 4324 bytes

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