Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9496d16e134a1d…

MALICIOUS

PDF

56.4 KB Created: 2020-09-01 13:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce95393abf1eb36c566d6b78970993f7 SHA-1: c03b160bb5948fc11bbcf8edc2b63e212b04c4b2 SHA-256: cb9496d16e134a1d0caa54c528f59da9331212dbb865fbe42f55d47679cbaa37
152 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier as malicious. It contains a large number of embedded links, with one pointing to a known malicious redirector at 'ttraff.com'. The presence of numerous links to 'static.usrfiles.com' suggests a link farm or SEO manipulation tactic, likely intended to drive traffic or host further 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.com/wix?keyword=android+cardview+example+with+gridlayout
    • https://static.usrfiles.com/ugd/9e14ca_17743068dd4342dea83b5160084945fd.pdf
    • https://static.usrfiles.com/ugd/8b2c09_571c197366c44c458f303fca90adbdcd.pdf
    • https://static.usrfiles.com/ugd/136d07_e53b57a89e604103ae05fae1a31598be.pdf
    • https://static.usrfiles.com/ugd/8e1900_49b5aa88f04f48e5bd9f59e4726f2949.pdf
    • https://static.usrfiles.com/ugd/87a178_7d59cbe0a4a949ee913db8093493e491.pdf
    • https://static.usrfiles.com/ugd/735189_5546bb42a07c43099ab5cee4cd45e8b8.pdf
    • https://static.usrfiles.com/ugd/ade4e6_207d0c328d1c4dc8bcdae212a5091312.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b115f2842dc46fd86c817f23cd85627.pdf
    • https://static.usrfiles.com/ugd/4d6844_14da0007765d42ff9b8ad920fd75fa94.pdf
    • https://static.usrfiles.com/ugd/b8c837_82d68c2fe8a948b0bf6390ae701f5144.pdf
    • https://static.usrfiles.com/ugd/63d3ad_697ac2d4c2194176b0ecb2fa786c6a24.pdf
    • https://static.usrfiles.com/ugd/a2e20a_5ce8acba89b946c5943ef163cff5b806.pdf
    • https://static.usrfiles.com/ugd/0a51c1_288af20f332b4c8b829b9e54c68733c3.pdf
    • https://static.usrfiles.com/ugd/6da380_b3e3ecedcd184d2eb7cdc8397724059c.pdf
    • https://static.usrfiles.com/ugd/c7a620_0ad481c5a433439a9f6b1dd5d9d987af.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/9721323260.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/78403385521.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/84462129027.pdf
    • https://cdn.shopify.com/s/files/1/0434/4460/0999/files/how_to_uninstall_dropbox_on_mac.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f1d.bin
c1d046e6803378bb19382cb7409b3f2d11d31d38c934fa3fc7369fa942ca0d04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1D 5620 bytes
font_01_sfnt_off0000a235.bin
288505a349f6bdc04d6daa18811c0a4f20189f160a772ea1ccc4eae57b12628d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA235 16256 bytes

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