Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf97cc1d5edaa515…

MALICIOUS

PDF

50.8 KB Created: 2020-07-22 07:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee962c55ed4a72b2aea970a05206e193 SHA-1: 66fab73d99497e9d70ca1a5f68f27c68d8fd2532 SHA-256: cf97cc1d5edaa5150456a73539d04c1769ad99beef33169c9448c32f294ec573
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document's body text, though heavily obfuscated, suggests a lure related to educational content ('how to use abacus for addition and subtraction pdf'). The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or redirection attempt. The ML classifier strongly supports the malicious nature of the file.

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=how+to+use+abacus+for+addition+and+subtraction+pdf
    • http://files.killpests.co.uk/uploads/1/3/1/8/131871992/267120.pdf
    • http://files.agathafashion.shop/uploads/1/3/0/9/130969375/9654079.pdf
    • http://files.bernyrothschildfoundation.org/uploads/1/3/1/3/131384674/c22019bb9f8cba.pdf
    • https://pavofozib.f
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/60720821584.pdf
    • https://cdn.shopify.com/s/files/1/0433/7002/1014/files/tofebemukusitevesiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/makemupi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0729/5140/files/giduru.pdf
    • https://pavofozib.files.wordpress.com/2020/07/39752706851.pdf
    • https://bepakarotoj.files.wordpress.com/2020/07/74385235721.pdf
    • https://vivuditefe.files.wordpress.com/2020/06/patidixofufid.pdf
    • https://wenopunufata.files.wordpress.com/2020/06/70000923621.pdf
    • https://cdn.shopify.com/s/files/1/0429/5294/9913/files/88721515862.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5587/files/simapovojokotipidawelut.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6834/files/85371962522.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/72112288427.pdf
    • https://cdn.shopify.com/s/files/1/0433/2696/3865/files/xisawibebabusapalij.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_off000087a3.bin
2f5817d132779e5836ac0b97430e1441790fe6bbc45ef9c9d94a8a1a93e081e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A3 5192 bytes
font_01_sfnt_off00009962.bin
cc0e95f34a09ce6f20ecb6c718860c39c163ba3d139ddffabb62d327015cea4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9962 10960 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.