Malicious PDF — malware analysis report

Static analysis result for SHA-256 501dde60ea0d555a…

MALICIOUS

PDF

40.2 KB Created: 2020-09-01 14:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320ce772606fba8b74e0a3a12553496e SHA-1: 74fd3c8a504121286673f5d1dd2079bc58939b8c SHA-256: 501dde60ea0d555aaa50acc4309350c1064f623b4ca8560eff636630f1a86264
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a link farm with numerous external PDF links, many pointing to static.usrfiles.com. The primary malicious URL identified is https://ttraff.com/wix?keyword=resume+template+for+clinical+research+associate, which is likely used to lure victims. The document body contains garbled text but includes the same search query as the malicious URL, suggesting a lure related to job applications.

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=resume+template+for+clinical+research+associate
    • https://static.usrfiles.com/ugd/43d598_36bcd0266cf148368f8399d8c5d2ad66.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6e67f3ef8974a8db3e9e548c42f63bc.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_384ceb62350b47c0b7a14abcd146630f.pdf
    • https://static.usrfiles.com/ugd/a31856_fa22bb597ecb423db15419cf36df2ce5.pdf
    • https://static.usrfiles.com/ugd/6df952_5e97f1b256c641fc8f3795a73d970f69.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2a2ab1049a94d1a8a39eef67ba22b0b.pdf
    • https://static.usrfiles.com/ugd/69b86f_3892b40ee5b94fe28937a73f5322d0c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_78da9fabcc9d4a2cb9a8509cdee0d3bb.pdf
    • https://static.usrfiles.com/ugd/db1da1_184c30920cb14be7b41eb70ff6c22e39.pdf
    • https://static.usrfiles.com/ugd/c068f8_76ede0b4471445ad8aa322fa03c02f49.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1432/files/xigawolamasetodofuvuwedet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0674/files/on_chesil_beach.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ec3.bin
c97417daa13451b3427a646c10ac7b732a72fa9cd958d9d396f9a010447af0f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC3 5260 bytes
font_01_sfnt_off0000707f.bin
acf0c090ea5e4ebb5739a017236f4d5ae296e8ccf57f7b4da211276cdcfdef67
pdf-font-stream PDF embedded font (sfnt) at offset 0x707F 10468 bytes