Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafa1a2a9739f3d2…

MALICIOUS

PDF

48.5 KB Created: 2020-08-02 18:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 284eedfac5b23489c9d953a893d470aa SHA-1: f0c48990c39d45da9bb60544d8ed05bab7984ef6 SHA-256: bafa1a2a9739f3d2b42f400e1e7efb41a281d2355da22bc19e21985110ee5546
154 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=cookie+clicker+building+cost+calculator'. This URL is presented within the document body, disguised as a calculator, to entice users to click. The sample also exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains, suggesting an attempt to obscure the malicious destination or leverage benign domains for distribution. The ML classifier 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.ru/pify?keyword=cookie+clicker+building+cost+calculator
    • http://files.robertjanlooysen.com/uploads/1/3/2/6/132682790/2055702.pdf
    • http://files.nworldweiqi.com/uploads/1/3/1/4/131454523/5056024.pdf
    • http://files.forwardintime.com/uploads/1/3/2/7/132710630/raromufotevaj-pobigog-liwope.pdf
    • https://cdn.shopify.com/s/files/1/0433/7814/7491/files/kovuwebosapis.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/fupeviwarobutigarasaxek.pdf
    • https://cdn.shopify.com/s/files/1/0434/7812/2649/files/luxotipuditagikeberup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12086745869.pdf
    • https://cdn.shopify.com/s/files/1/0440/4497/6278/files/munujalixedifeg.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/33789905397.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/4092490891.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/3197917105.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/40953612059.pdf
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/40527787837.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/25100006791.pdf
    • https://cdn.shopify.com/s/files/1/0440/5270/9526/files/c_generate_random_number_in_range.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdf
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/vamuvupefu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/yfn_lucci_56_nights.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_off000065e0.bin
1327df147607c41336b8b37951b6716a5bbf61074a9d165654dc3cd0607e59be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E0 5216 bytes
font_01_sfnt_off000077a2.bin
8ef455bce8b2654158c1973e5caf2eb30c2aed3e027a85f13d7e01a2a8ab7536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A2 14112 bytes
font_02_sfnt_off0000a4ef.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4EF 4324 bytes

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