Malicious PDF — malware analysis report

Static analysis result for SHA-256 f988daa699e81da3…

MALICIOUS

PDF

42.3 KB Created: 2020-09-02 12:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228f4afa334f64b2eda47cecb4e7fb22 SHA-1: bf46947235c33d2baa6c7173299e429f95d0f638 SHA-256: f988daa699e81da3fb3925cfefc153eab9e3e5ce7417536ca5a52fbd9f8877e5
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to overwhelm or deceive users. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware delivery site.

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=blackfinn+ameripub+nutrition+information
    • https://static.usrfiles.com/ugd/913720_c2969b3b84c84a64bcffdf1943458b44.pdf
    • https://static.usrfiles.com/ugd/d954c5_1f826d3c36d94fd18e6c47dca6429e9d.pdf
    • https://static.usrfiles.com/ugd/f1d680_256a49d91e7649bdb0a6b998b8519041.pdf
    • https://static.usrfiles.com/ugd/78c764_7894a57caa8e456483742082272569e8.pdf
    • https://static.usrfiles.com/ugd/38bf1f_e5ba5c6ce78b4be7826c0a31f2086a6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c18c599f1804bd293cf5e7b71338cb3.pdf
    • https://static.usrfiles.com/ugd/3e7897_13f6c1666b7241809c92ea75db9f34ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_22813a1d775f470e99dea0f87da2c60b.pdf
    • https://static.usrfiles.com/ugd/10a4aa_a158c7608f264d40bb34102fc6f2715c.pdf
    • https://static.usrfiles.com/ugd/69695d_73eb8c2823a845818a9e7330fdbfea33.pdf
    • https://static.usrfiles.com/ugd/15cd4d_4aebb2b391c744999b17a4f77e441db8.pdf
    • https://static.usrfiles.com/ugd/43d598_883c198ae9dc4e9eba04cf4832387e31.pdf
    • https://static.usrfiles.com/ugd/2486b5_84a43db98236401c92e2ea08c30b8c89.pdf
    • https://static.usrfiles.com/ugd/6df952_a1a0023ef8284d3a8a7257eaaa5c5dd3.pdf
    • https://static.usrfiles.com/ugd/81d6a4_163ae2b8292e47f29d234784a1c1bfa0.pdf
    • https://static.usrfiles.com/ugd/9bd8c3_a66f8fb6f7a14daf9e2d7da1ab46e78e.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_off000064da.bin
309cab58cf4ba71e939027de797c4a598e2e44508eff39e42658fbf2a3f6814a
pdf-font-stream PDF embedded font (sfnt) at offset 0x64DA 5236 bytes
font_01_sfnt_off00007699.bin
1c7d5832da2458b731493d6770fba658605ce88d5d966b99c304a8bdd68ab11b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7699 10540 bytes