Malicious PDF — malware analysis report

Static analysis result for SHA-256 712dec0d0d2ef507…

MALICIOUS

PDF

43.1 KB Created: 2020-08-08 16:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b4ac97bbbc17facfb986241ba0de57 SHA-1: f5d27b8cc3e182412d675f210330e3711be2d467 SHA-256: 712dec0d0d2ef507175f9dd2886a17f5cb5f263102941ee2146a6cad13768706
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=simile+worksheets+pdf+grade+3, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to potentially harmful content.

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=simile+worksheets+pdf+grade+3
    • http://dagajuse.sadielansdale.com/uploads/1/3/1/3/131398140/83e17f9a47.pdf
    • http://mukuxofi.sfhillsanddrills.com/uploads/1/3/1/8/131872225/zezixurebixizonofi.pdf
    • http://deramiko.ginnylcusack.com/uploads/1/3/2/6/132681501/87745ff.pdf
    • http://files.wallbrosdrywallservices.com/uploads/1/3/0/8/130814056/8bacfe115ee2423.pdf
    • http://files.carsontidwell.com/uploads/1/3/1/4/131438249/mumiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3870/1728/files/hp_laserjet_p1606dn_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5012/2916/files/musefovulijilisowuxiganos.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/zedajonurekere.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95610310087.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3349/files/sadirevurutojorasigol.pdf
    • https://cdn.shopify.com/s/files/1/0433/5311/2735/files/6484206130.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/fodusagodopotunujov.pdf
    • https://cdn.shopify.com/s/files/1/0433/6497/4742/files/kobisoxaruxijebanikimofi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6246/0577/files/buwugup.pdf
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/binodepoza.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/66022643971.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1758/files/76951501851.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_off000068ce.bin
4460a79688bf6edfa42e2952849d6c50dd9c3c20a455b41021fd79bf4381029a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CE 5876 bytes
font_01_sfnt_off00007cb6.bin
862c965ef0f8e99ec83ccd5c37e13dbc9dd131dc42b0155a054b19a3655c5845		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB6 10076 bytes

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