Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a91d62e3da49c03…

MALICIOUS

PDF

49.0 KB Created: 2020-08-20 03:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2b0e462bbf22ce471af69e63c44a960 SHA-1: cf0f82774dfec293fb2ccf3f48c07b6395a8401a SHA-256: 7a91d62e3da49c03721a8c0b2b209dbc7dec30a1dd9073901f312421b5770faf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'bike games' and the malicious URL, suggesting a lure to a scam or phishing page. The ML classifier strongly flagged this PDF as malicious, supporting the presence of 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=bike+games++now
    • http://files.barbaradavisgallery.com/uploads/1/3/2/6/132695280/jepokirebo.pdf
    • http://files.miracleministry.net/uploads/1/3/0/7/130775400/dizoja_zupobukomu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/2076/0734/files/megolala.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/hp_deskjet_2541_driver.pdf
    • https://cdn.shopify.com/s/files/1/0449/1676/8923/files/law_dictionary_english_to_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/75932477535.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/jomewemepavovosuwodusep.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5922/files/dumilim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8003/2160/files/16611281404.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/diluxixutelifejudigazi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9730/files/jimaboserexutipewusidiko.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/world_war_2_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0831/files/sqlite_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/gerivulorizekojufubujomew.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075dd.bin
18af0ba4e7a1c3b646b95edbae8cdf5f76d27ff224fef0f01c32ac65965cf42c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DD 4788 bytes
font_01_sfnt_off0000861a.bin
be59f8726a4a580064223760169d242d0e19d4202245ba7b850d676bed38a678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x861A 10268 bytes
font_02_sfnt_off0000a91e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA91E 4324 bytes

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