Malicious PDF — malware analysis report

Static analysis result for SHA-256 495acce3d905e9e5…

MALICIOUS

PDF

51.4 KB Created: 2020-08-29 20:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394b0cbef871a116412034111b74cd96 SHA-1: bfcd76774e345482992607b19cf4b3e2fa94b201 SHA-256: 495acce3d905e9e53b26b1dd6a3b0a9cc729ad1aaec0d1b3137aa65b98e2129a
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a search result for free sheet music, which redirects to a malicious URL. This technique is commonly used for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains a large number of external links, suggesting a link farm for SEO manipulation or traffic redirection.

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.club/wix?keyword=true+colors+sheet+music+free
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/madupupikotov.pdf
    • https://cdn.shopify.com/s/files/1/0436/9920/8346/files/convertir_de_a_word_nitro_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4968/files/jelegaxilonizawagujivab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/ansiedad_estres_y_deporte_sara_marquez.pdf
    • https://cdn.shopify.com/s/files/1/0437/7044/5975/files/susevoponowizesakejit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8588/1759/files/lagu_baek_yerin_across_the_universe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/ranegobifisuxafilalaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9062/5191/files/44852681515.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/10663101389.pdf
    • https://cdn.shopify.com/s/files/1/0433/4193/8856/files/pearson_anatomy_coloring_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/4887/7736/files/98947395177.pdf
    • https://static.usrfiles.com/ugd/b8c837_da74cf5d45ab41b8ba8732aa2e56ac45.pdf
    • https://static.usrfiles.com/ugd/b8c837_b34d500d95844267aa7a0fb2f1b9653a.pdf
    • https://static.usrfiles.com/ugd/b8c837_a832a50151e8428ca01710cdf281340c.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
font_00_sfnt_off00007885.bin
8c117e4d83b79aa973c7a594df1b2440604cf8b30387f4bf6b0bf7f6ec7e6437
pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 4860 bytes
font_01_sfnt_off000088e6.bin
abb5959e06bce10def0e4bf2c5ac274da68605bff9d958e66c019b525a5a6b02
pdf-font-stream PDF embedded font (sfnt) at offset 0x88E6 10156 bytes
font_02_sfnt_off0000abef.bin
84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52
pdf-font-stream PDF embedded font (sfnt) at offset 0xABEF 16100 bytes