Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40d3d8e3b70a4b6…

MALICIOUS

PDF

47.8 KB Created: 2020-08-24 13:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e61337303494ea3d620084c74e6a5277 SHA-1: 073efa96e646d79bf1b6c542ae1d77994d1122f0 SHA-256: e40d3d8e3b70a4b6502c1c1db8460249b8e08c5e48f0eee58b96193a8d30eec7
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, specifically pointing to 'https://ttraff.ru/pify?keyword=phonebuster+caller+id+faker+apk'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed to distribute malicious content. 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.ru/pify?keyword=phonebuster+caller+id+faker+apk
    • http://files.robbiesadventures.com/uploads/1/3/1/8/131871970/liwiga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9236/1887/files/42479809254.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/adobe_reader_wikipedia.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/zolijopokoviduwagazof.pdf
    • https://cdn.shopify.com/s/files/1/0457/5831/6700/files/synergy_spanish_course_free.pdf
    • https://cdn.shopify.com/s/files/1/0453/3213/6091/files/oxford_picture_dictionary_workbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2748/8168/files/19035096766.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/nibof.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/musunep.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/wojajopab.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9203/files/tabimafovujabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1602/7303/files/fitupuraf.pdf
    • https://cdn.shopify.com/s/files/1/0440/0542/5310/files/5987981802.pdf
    • https://cdn.shopify.com/s/files/1/0434/7219/1641/files/fejivofuvululokakat.pdf
    • https://cdn.shopify.com/s/files/1/0437/0179/7019/files/libro_del_caballo_de_troya_1.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
stream_005_off00009423.bin
11b65abfc92f1159baaeea81920e2d99f6a2a28b7adc00d836c3ea128ea0abf9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9423 18712 bytes
font_00_sfnt_off00005cb9.bin
9654e1ef997d5060ab402edef38b37567ecaa070952d47f469d6a25e5be56257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB9 5448 bytes
font_01_sfnt_off00006f2b.bin
115030cd24104609bafd89ef4433d0d87d28748c824db8aa5fdd3d8f17eb4bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2B 10828 bytes

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