Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f04573e72cff91b…

MALICIOUS

PDF

40.0 KB Created: 2020-08-06 07:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 291a86e18f69436b54d72fcf7cac8794 SHA-1: d25afb09f2e7d39a405b0c395478e7efb043a873 SHA-256: 6f04573e72cff91b326eda159d467d0d684419804ce81a5574b0d92acb543a4b
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure for free PDF downloads, likely to distribute malware or phish for information. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a link farm strategy.

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.ru/pify?keyword=myers+briggs+personality+test+pdf+free
    • http://files.sierrashackshapingminds.com/uploads/1/3/2/6/132682051/lokowif-jixurunazatoso-reduvaweg-sifara.pdf
    • http://files.edtechtalk.org/uploads/1/3/1/4/131437402/8341603.pdf
    • http://files.blueeyedqtpies.com/uploads/1/3/1/3/131379894/ferotedibe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5649/5769/files/luworuzanaxow.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/tofixaleduropopiminelixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/naraxaluk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/jixosegodojulimapetojil.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3965/files/pufijujenifakelixilugolus.pdf
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/history_of_english_literature_short_notes.pdf
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/lesuludutep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4826/files/72585194584.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/72397548306.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/fiputeralufox.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_off00005ebd.bin
99e44272a1b392371b178fd40f01cb904070eefbc287e16b146471deadc4255d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBD 5456 bytes
font_01_sfnt_off00007169.bin
1d8c52014b25b6814b9a8848f75f46243fb2bc1af560a6750eaba16c865ce987
pdf-font-stream PDF embedded font (sfnt) at offset 0x7169 9896 bytes