Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a0879d540fe787…

MALICIOUS

PDF

39.1 KB Created: 2020-09-05 11:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b46a78f1a762ed3a41e3357f4ed72be5 SHA-1: 50ee613303460c04ea8b5758f3a658cc055e7c9f SHA-256: 62a0879d540fe7877fe68069adcd655c73a1e7577f1588cca7a5a79f9f3cf828
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector. The ML classifier also flagged the PDF as malicious with high confidence. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to a potentially harmful site. No scripts were extracted, but the presence of malicious links indicates 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.me/wix?keyword=dangling+modifiers+exercises+with+answers+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/625844_1c1f1f64997441caa7b806aa906632e1.pdf
    • https://static.usrfiles.com/ugd/5ecadc_34729d28854a4b4482fa8dc241307deb.pdf
    • https://static.usrfiles.com/ugd/510a18_68bd49fe0ce6453cbe0cfe36fb63ca6e.pdf
    • https://static.usrfiles.com/ugd/fe0276_c78427f8db1041da94ad81a8ab65e085.pdf
    • https://static.usrfiles.com/ugd/a76634_cc055760f8584fb9af0ca6af50505d42.pdf
    • https://cdn.shopify.com/s/files/1/0432/2872/5405/files/74653089460.pdf
    • https://cdn.shopify.com/s/files/1/0459/9244/4061/files/restrictive_practices_fact_sheet_victoria.pdf
    • https://static.usrfiles.com/ugd/7ff653_87ef4fec87e843698ff7fd5816e8c8b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a4153a7e19d47fa837278ad535180e7.pdf
    • https://static.usrfiles.com/ugd/a8ca0f_c9007d200d104039bda44eb1f1aaf78a.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4760/files/zubimanofipokamurisegar.pdf
    • https://cdn.shopify.com/s/files/1/0434/9709/5333/files/raruwirubenuravod.pdf
    • https://cdn.shopify.com/s/files/1/0457/3783/6710/files/10011651899.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_off00005970.bin
403fa674e15684fe30a84f691a9c9f1f5af9a51e6d9ba79c5254f1c37aedb3f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5970 5728 bytes
font_01_sfnt_off00006ce8.bin
9eb2b801e0c6d06552bba4cffd775be186abbd833a7ba8c8757aed84bd411f53
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE8 10180 bytes