Malicious PDF — malware analysis report

Static analysis result for SHA-256 750fec2aa335a1d3…

MALICIOUS

PDF

44.2 KB Created: 2020-08-30 18:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39ca7c9d781d095babce6d2b85c195d2 SHA-1: f3cdb77d5bc6cbbad9400382e89f186a71c6f2cf SHA-256: 750fec2aa335a1d3f598e2c85a1b72885a72ff19373e1cbacf6dc1a54c33f903
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for a 'sample statement of purpose'. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger link farm, suggesting a campaign to distribute malicious content.

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.com/wix?keyword=sample+statement+of+purpose+for+graduate+school
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/xetixonevas.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/nevokajubilasajatafexixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/pinawijavena.pdf
    • https://cdn.shopify.com/s/files/1/0438/0036/3169/files/housewarming_party_invites_free_template.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a694811ad564bd38b965194c57d12a1.pdf
    • https://static.usrfiles.com/ugd/e643da_0a4405db81c747ab9ad1d145e3cfb060.pdf
    • https://static.usrfiles.com/ugd/9219f8_90598e7681db4a8a9abc3ced227afed7.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4f49d37fb594763bca7091127031944.pdf
    • https://static.usrfiles.com/ugd/b8c837_66def0301fec4b8982a9bcd60fb46537.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/78324246825.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bibekejufalakudogaloseja.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0817/files/jakogevabijuxuj.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_off00006f24.bin
3cf5c793e144b521507ed6e49fea67660b80b7ff0f75bf6f63d46355956ae723
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F24 5672 bytes
font_01_sfnt_off00008238.bin
bbf7b41179a54aa4a54167ba2858453e7cc26526d3eb4e06f2c0f79c10cbe0fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x8238 10184 bytes