Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c8090542e23f3a…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 12:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be58dc556f244dc222b67e5455a0eef1 SHA-1: 0b813e5743512a5d35bf4000301050bded0b75ab SHA-256: 76c8090542e23f3a261123eb15891517d2dcf5a36493dad2d71a75120eab85d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for free templates. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL suggests a phishing or malware distribution attempt.

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=circle+diagram+template+powerpoint+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/83e24f_cb3b5fadb9a74e91ab309097c8404afb.pdf
    • https://static.usrfiles.com/ugd/c75f60_1449304b5a794f24a2579ac0c8cc8af4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2385d517cd24c5f8a47f9ca32f2eb64.pdf
    • https://static.usrfiles.com/ugd/b88e3d_39fb10bdb11e47178a2f53932d5e423d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7318f5f86d74ce6b90b071dcefc3fb6.pdf
    • https://static.usrfiles.com/ugd/0b46e6_6aa6c33605a14163b39e514282ae59cf.pdf
    • https://static.usrfiles.com/ugd/3649d2_8c3585de0d5d47728fe8c33d50e3da1a.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/acidifiers_in_animal_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/57141018533.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/dinilipatevular.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2158/files/anlage_n_2020_ausfllbar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9453/1493/files/pujajawuwisul.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/gudiwanalawinusitekedibeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/biponadokut.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ba.bin
3465811fa9291fd41d600d48907c7fc2c7370a4338b1ca2dfeae7092d3d6cb41
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BA 5292 bytes
font_01_sfnt_off000073b9.bin
76aa3ccfcbd0f117562f215c1ae0de8f7da2b62e2b92d047b66ea3e0a6424b96
pdf-font-stream PDF embedded font (sfnt) at offset 0x73B9 9868 bytes