Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9528d70fa4b03c…

MALICIOUS

PDF

47.1 KB Created: 2020-08-16 11:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0ffae9dcf4e987c86f41c2c67ca5782 SHA-1: 7cdd54b637457e497555e650504f030429f5de1b SHA-256: 7b9528d70fa4b03cc7cc5cc79034bb4de5155734f2fa53bdbb52fd20e5c625d8
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body also contains the URL 'https://ttraff.com/pify?keyword=appchina+apk+telecharger', suggesting a lure to download applications. The presence of a large number of external PDF links, many hosted on Shopify, further supports the idea of a link farm designed to direct users to external 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.com/pify?keyword=appchina+apk+telecharger
    • http://gedulu.knox-united.com/uploads/1/3/0/8/130814328/fajawutere.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/mekuruxikegewawita.pdf
    • https://cdn.shopify.com/s/files/1/0437/7948/9946/files/harlem_shake_js.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/rubojajimoxedarowi.pdf
    • https://cdn.shopify.com/s/files/1/0443/3159/7980/files/92468222356.pdf
    • https://cdn.shopify.com/s/files/1/0437/6074/6648/files/blood_type_diet_food_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/liwojewovinokarukin.pdf
    • https://cdn.shopify.com/s/files/1/0440/1440/3742/files/aya_beshen_nude.pdf
    • https://cdn.shopify.com/s/files/1/0448/9605/9547/files/introduction_to_automata_theory_languages_and_computation_pearson.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/97374403665.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_off00005a9e.bin
a131e893b5208c9bf1077db7b5b27d2d24eb18f919a585f41395840f6aa114dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9E 4748 bytes
font_01_sfnt_off00006aa1.bin
b9b653fd14ef31349d93058a070786ab70fa215a15175c65021f8055f50bee8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA1 9864 bytes
font_02_sfnt_off00008cae.bin
055dd542a75b41b8c12c294075aad027c1d82da78fa3869ad2cdf6bcc3138586
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAE 16112 bytes
font_03_sfnt_off0000a189.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA189 4324 bytes