Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c7fbdc24e89f4e…

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 02:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 162f84ec1ae367541532d400662a0aa8 SHA-1: 77ed2e7ffb84412e67cc84598575d2d7bc224c5f SHA-256: a7c7fbdc24e89f4e36732c9f60ed1ca1c55dac3a462b1fc8f455192d177ad6d4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=papa+kehte+hain+bada+naam+karega+song+download+mp3'. This URL is presented within the document body, disguised as a song download link, indicating a social engineering lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be directing the user to a malicious external resource.

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/wix?keyword=papa+kehte+hain+bada+naam+karega+song+download+mp3
    • https://static.usrfiles.com/ugd/b8c837_8cc65435eefe4faeafc675260b5c723a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d6ffe30a6784d7c9db0aa693134c622.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a1b385dfa724ded9c2d146353f6fa11.pdf
    • https://cdn.shopify.com/s/files/1/0440/8963/9077/files/votabutevumokon.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3259/files/52225589292.pdf
    • https://cdn.shopify.com/s/files/1/0440/4789/2630/files/how_to_create_a_book_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/benedictus_qui_venit.pdf
    • https://cdn.shopify.com/s/files/1/0430/9254/1589/files/zidomuduxil.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/guided_math_stations_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/whatsapp_plus_apk_free_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/13624835304.pdf
    • https://cdn.shopify.com/s/files/1/0462/6504/1047/files/brand_book_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/27298042794.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/69035306448.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/
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/2729804

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057b6.bin
a18e9df1f9cc8d5d417e64eb22169b12e068ca9ed650f174cc1f7d6a45ba09bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x57B6 5832 bytes
font_01_sfnt_off00006b6d.bin
05da67fa971b11eb220f56ea4f8ee4ae6d6d9d7293a2a11c1c4a30f6435e8c53
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6D 15848 bytes