Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9154b37b430d2a5…

MALICIOUS

PDF

59.4 KB Created: 2020-09-01 03:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26e97e8f13826a8e8a0e9b94b5d8f218 SHA-1: 1b38cd92442a959d5853d4bb695e8e0cbeaabfea SHA-256: a9154b37b430d2a5dde58771eeb86b371a29f29f55df2883cf83e1cd41df7a7f
154 Risk Score

Malware Insights

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

The PDF document contains a deceptive title related to mobile phones to entice users. It embeds a link that redirects to a known malicious domain, ttraff.cc, which is flagged for malicious redirector activity. The document also contains a large number of embedded links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to distribute the malicious URL. No scripts were extracted from this sample.

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=latest+android+mobile+phones+under+20000
    • https://static.usrfiles.com/ugd/b8c837_760f2e9d855641ee95ef767bd6cd136c.pdf
    • https://static.usrfiles.com/ugd/96bf9d_41b04aeb51dd4c01aa1cb433a87cdc54.pdf
    • https://static.usrfiles.com/ugd/19ce5d_90f5ec21a5fe48fe9e501c1c188ebca0.pdf
    • https://static.usrfiles.com/ugd/f8de3e_11ace995d1b84f018819cd6ce1510929.pdf
    • https://cdn.shopify.com/s/files/1/0428/3822/9158/files/pajofifiroxilexu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/oxy_acetylene_gas_cutting.pdf
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/xujujulodefafufinunekotox.pdf
    • https://static.usrfiles.com/ugd/80c1db_a90a31b8979c4a7a9bd61995762a0f26.pdf
    • https://static.usrfiles.com/ugd/b9801a_b81a059c1ca74216ac4566a7b55ffdff.pdf
    • https://static.usrfiles.com/ugd/63022f_4048797c793142659d924d326d3fb12b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c9ac6d87a2b44e1a8b8648094a9387c.pdf
    • https://static.usrfiles.com/ugd/eda9ba_cc6e0fc977ab4a29a0a797054307f076.pdf
    • https://static.usrfiles.com/ugd/97493d_b93eea2b0b6e435794ff47d68b5531e8.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084f9.bin
9f347fb11b5ce41f344c8803d1d947dc97215499411f195397ee8248b36458f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F9 5436 bytes
font_01_sfnt_off00009736.bin
153678d472025498768e7a254c30e68c1199b77c6e6ea6801ba718f16658d928		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9736 10976 bytes
font_02_sfnt_off0000bcdf.bin
7ec3252b81f7f270858b314c2eed8386446a61743cc451621a2e02bf30326cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDF 16288 bytes
font_03_sfnt_off0000d22a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 4324 bytes

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