Malicious PDF — malware analysis report

Static analysis result for SHA-256 c909127ed6bb6bd3…

MALICIOUS

PDF

32.8 KB Created: 2020-08-07 19:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e63bbd7caafdd25983a7fa43de9815f SHA-1: 066757a2624ea32f9762463291fc0418b3903251 SHA-256: c909127ed6bb6bd313ff8e06595634e0d51d134e75b54bb09d4d0d460a6f8508
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary redirector URL, https://ttraff.cc/pify?keyword=beekse+bergen+plattegrond+pdf, is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, further supporting the malicious intent.

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=beekse+bergen+plattegrond+pdf
    • http://files.fineartbyraven.com/uploads/1/3/1/4/131438137/7958121.pdf
    • http://files.healyourfinances.com/uploads/1/3/1/1/131164456/3803356.pdf
    • http://files.adamjlindemann.com/uploads/1/3/1/4/131438353/fikozopav-zaluguse-kosakiripil-kasamitokidof.pdf
    • http://files.hickmanhighschooltheatre.com/uploads/1/3/1/3/131379111/f61a0b993e1.pdf
    • https://cdn.shopify.com/s/files/1/0430/2327/0042/files/nawoxora.pdf
    • https://cdn.shopify.com/s/files/1/0428/7630/5564/files/zumiwutumuze.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/95315785607.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/tbs_baseball_announcers_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0494/files/ridadoxesi.pdf
    • https://cdn.shopify.com/s/files/1/0449/2728/7451/files/canula_nasal_de_alto_flujo_en_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/95485454067.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/41134365732.pdf
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/83175159921.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5815/files/avicii_wake_me_up_chords.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_off000043b6.bin
0b074ea726317b627a43be38266cc91f339b9253891ef455899206f629602680
pdf-font-stream PDF embedded font (sfnt) at offset 0x43B6 5464 bytes
font_01_sfnt_off00005658.bin
c287e4991afc88908209792274b18a4358a5e2c2f27bae4ec90572aa95e41698
pdf-font-stream PDF embedded font (sfnt) at offset 0x5658 9400 bytes