Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c6ec81675b3931…

MALICIOUS

PDF

41.4 KB Created: 2020-08-15 01:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 604d7e2ced93a88ff8d3b21d0497319c SHA-1: 4295cfbba2ce99b909a97408d6d328a0c7915953 SHA-256: 10c6ec81675b393173f63477041e141aa53239586c94db4a9e70a8faed2b9dca
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 redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL related to 'aadhar card by fingerprint software apk', likely a lure to encourage clicks. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of 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.ru/pify?keyword=aadhar+card++by+fingerprint+software+apk
    • http://files.gcklink.org/uploads/1/3/0/7/130776070/geratitux.pdf
    • http://jagufib.iriediner2go.com/uploads/1/3/2/3/132303035/pefujopema.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/learn_android_studio_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1589944702.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/69359902022.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0300/files/xobidopomavemufajogir.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8497/files/wodiputevugidixitovulu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/92760060446.pdf
    • https://cdn.shopify.com/s/files/1/0428/7394/6275/files/vasosuzapenuvurerimu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9665/2443/files/convert_kindle_to.pdf
    • https://cdn.shopify.com/s/files/1/0435/6354/8833/files/rijagapupijup.pdf
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/fannie_mae_using_retirement_income_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5388/files/analfabetismo_en_mxico_una_deuda_social.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/85536116276.pdf
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/photoshop_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0440/4379/6645/files/nirabopebafedimu.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_off00006238.bin
587a0a09e1275680ff990638231ab4ce63dffc2f674284f9ec9985508bcf9811		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6238 5772 bytes
font_01_sfnt_off000075ed.bin
3e8ff5838c2447926b6c3992335a8fe9ef17fcc06c9b4def402dc9b5dd09d47c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75ED 10112 bytes

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