Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2333d2da21b9191…

MALICIOUS

PDF

46.2 KB Created: 2020-08-27 15:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24759bf23a04511a7558e129f4c50a9d SHA-1: 15874dc4f5e6193b8f509d72f926ab8251f026bf SHA-256: f2333d2da21b91911bddc9d26027979618d4ca8aa81b3f777d43340ec91b8c3d
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 links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting a deliberate attempt to lure users to malicious content. The presence of a link farm and a malicious redirector URL 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.cc/pify?keyword=reacciones+qu%25C3%25ADmicas+en+la+vida+cotidiana
    • http://files.thebookishblonde.org/uploads/1/3/1/4/131453177/4263322.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4977/files/zofunafoverutozum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/44487936299.pdf
    • https://cdn.shopify.com/s/files/1/0434/1176/7448/files/platform_number_for_train_12028.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/tufesaza.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/bacterial_growth_rate.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/96427369996.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/futijiregumaxalawebop.pdf
    • https://cdn.shopify.com/s/files/1/0458/3289/6675/files/los_colegas_del_barrio_1996_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1797/files/sufasugujowog.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9190/files/bwv_578_organ.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_off00007423.bin
79beb1f31a749e3b255bdfaac0da879b966eac4f77f6ac277bdf6ce4c9afbd4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7423 5236 bytes
font_01_sfnt_off000085eb.bin
e2bda55595353cd398148723be9e0997fecf47b39e744db479ec93da67990583
pdf-font-stream PDF embedded font (sfnt) at offset 0x85EB 10964 bytes