Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8be4006fcca69f6…

MALICIOUS

PDF

51.4 KB Created: 2020-08-14 13:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 169b72572782aba1372af2b7832d29d3 SHA-1: 904a73d8c958e911e032a6181db5c7969d357e95 SHA-256: f8be4006fcca69f6f71d4f5a0033e94e32366470615c90c4c53c1019ae0b1208
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=dc+dmv+knowledge+test+answers'. This URL is presented within the document body, suggesting a social engineering lure. The presence of a large number of external PDF links, many pointing to unknown domains, further indicates a link farm designed to distribute malicious content or engage in SEO poisoning. The ML classifier also strongly flagged this PDF as malicious.

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=dc+dmv+knowledge+test+answers
    • http://wurabuba.coachandpresident.com/uploads/1/3/1/4/131437246/jutiboreluna-ruvotoro-zapulevegavo-jejesodovam.pdf
    • http://nuvodadif.hooligansgp.com/uploads/1/3/1/4/131406082/gadusijij.pdf
    • http://kaxoduk.angiebkart.com/uploads/1/3/0/7/130775823/vubewoteloj.pdf
    • http://wajavaput.jacksonheightsofwb.com/uploads/1/3/1/8/131856373/rusivavusaluxumubas.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2612/files/birbal_stories_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/19471504027.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/wewonosaxavuvepovemira.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/ge_quiet_power_3_dishwasher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/todd_lammle_ccna_200_120_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6740/0601/files/18003618950.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/razijosop.pdf
    • https://cdn.shopify.com/s/files/1/0434/4361/7958/files/bajenujizudibikasegikeva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9144/4390/files/beltenebros_libro_completo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/25520491806.pdf
    • https://cdn.shopify.com/s/files/1/0430/5567/7591/files/97134973870.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cb1.bin
4f27095faf1b2cb58856b632bb589e13fd44577f0644bd47330e80e6644a990b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB1 5216 bytes
font_01_sfnt_off00008e71.bin
db9010b35406eda66f2273be14fde715f37d74caa034d2e1488620cdc3908ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E71 10580 bytes
font_02_sfnt_off0000b28a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB28A 4324 bytes

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