Malicious PDF — malware analysis report

Static analysis result for SHA-256 7535bd5b7a04afc6…

MALICIOUS

PDF

44.5 KB Created: 2020-09-04 20:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c0abf7251effcd4de0c0f3ac94f1690 SHA-1: bfbdb9c530e40ec2159f298eeb831da99a7202c5 SHA-256: 7535bd5b7a04afc683b85774fbdfe42f9d4bf4debc3b270c37fb451bf9a22694
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Cameroon economy pdf'. The presence of many external PDF links, some benign and some leading to the malicious redirector, indicates a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

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/pify?keyword=cameroon+economy+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5e8de6_d06e8de388774b47b4b348a15e0b92a4.pdf
    • https://static.usrfiles.com/ugd/f1780b_000e9e284d0f48e1bc308fe8a1135158.pdf
    • https://static.usrfiles.com/ugd/7ad284_9a67141a2e7949a3a9cc6312b80d59e9.pdf
    • https://static.usrfiles.com/ugd/daca0d_3b80bf8addb44a169a9f8748ad3fade2.pdf
    • https://cdn.shopify.com/s/files/1/0448/2839/3634/files/reversal_candle_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/palelewisagenemalo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/38912369329.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/gakusaputedorapetupisez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3149/3784/files/98962609930.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://static.usrfiles.com/ugd/269bb8_a518ba351111432bb7a63725dfd9d04b.pdf
    • https://static.usrfiles.com/ugd/4117a9_7aa40203153445f9917cc65d9bd472cf.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_off00006644.bin
7108f53f1c2810df9f1d87fdef46b1524509f5abd23501547859e3a1f88cf765
pdf-font-stream PDF embedded font (sfnt) at offset 0x6644 5096 bytes
font_01_sfnt_off0000778b.bin
6b756a45562412b5a7c47256088ca4e6cd7ecb2199804ebb4aef55e5809ad48b
pdf-font-stream PDF embedded font (sfnt) at offset 0x778B 14628 bytes