Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9bd9c347e061af…

MALICIOUS

PDF

52.5 KB Created: 2020-08-31 04:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d3bef351baac61e6acd70bb8e97495 SHA-1: f993f54b726b947361c93ff1ab3fe67f2677da7b SHA-256: ad9bd9c347e061af2170b815a3be38c510bcecd6a0a6631d0b08196a04cae7d4
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to SEO-optimized PDF files hosted on Shopify. One of these links, however, directs to a known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector suggests an attempt to lure users to a harmful site, likely for further exploitation or credential harvesting.

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/wix?keyword=siva+thandavam+2012+telugu+movie+wat
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/prevencion_del_cancer_de_piel.pdf
    • https://cdn.shopify.com/s/files/1/0463/2749/6859/files/aayegi_barsaat_kahan_jayenge_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2881/files/benedetto_xvi_deus_caritas_est.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/27809295219.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4663/files/noburuwokodibuwo.pdf
    • https://static.usrfiles.com/ugd/bf0735_96e220e7e38f41f5a0a859406a0c6ff3.pdf
    • https://static.usrfiles.com/ugd/89064d_926a86ece74944508dbeb5305a6f9e84.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/koxumugude.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/ritoma.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/84115441639.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4736/files/rapajisikomajefefejabom.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_off00006ad4.bin
46a027c7e65dba483a965def037ea66927989725bef7c48cbea705d355e1807c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD4 5544 bytes
font_01_sfnt_off00007d9c.bin
cef744e2f96f81bb07ab2556c8ff9693efc68c7b2e9cd58cfb8b86334e5f040f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9C 3132 bytes
font_02_sfnt_off00008a0c.bin
a7e3d7fb1430db77fcb01d75a48f060dd129c10a9e7bb848b3a4ae8a89630e29
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0C 10292 bytes
font_03_sfnt_off0000ad8a.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8A 16164 bytes