Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa42a80c35ca954f…

MALICIOUS

PDF

54.9 KB Created: 2020-08-22 08:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fba35727813f298fe8daadb46598404f SHA-1: 66a0ac62b0a7a86b37c1abf4a038ed149d81b3b0 SHA-256: fa42a80c35ca954fbde2c09879862e14ffafe3d73e2295de6d7d5e9739e263a3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains text related to "Aadhaar exam questions and answers" and the malicious URL, suggesting a lure for users seeking this information. The PDF_SEO_LINK_FARM heuristic further indicates a pattern of generating numerous links, likely for SEO manipulation or to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be the malicious redirection.

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=aadhaar+exam+questions+and+answers
    • http://popegafar.gtitusphotography.com/uploads/1/3/1/6/131606875/rudagovalikalobobasu.pdf
    • http://files.cck-iuc.org/uploads/1/3/2/3/132302810/6795727.pdf
    • http://jeduw.onehorseranchphotography.com/uploads/1/3/0/9/130969090/tagerobeku.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/23548337493.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/79511185574.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/32452510297.pdf
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/35100615446.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/bouncemasters_mod_apk_android_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/babetugubadizababikif.pdf
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/literal_equations_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/36362682418.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/nidaxulisutijinigurumodi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3643/files/araby_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/rizupam.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/laragatunejikipunoteme.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cc9.bin
c30327627540c77b81e513a120d0ff31f3c7bea30e61a7a4d212bf7af5d2d7f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC9 5192 bytes
font_01_sfnt_off00007e55.bin
ff49d2af1744378a27efb3dc337af3f4d52dbc34a86575962e8d774670f253d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E55 10224 bytes
font_02_sfnt_off0000a10b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA10B 4324 bytes
font_03_sfnt_off0000af0b.bin
b340c34bd07988d26f66feec834373b25093947f1abd7b109aadff364ca8d2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0B 9792 bytes

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