Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d939a27b8a8d91a…

MALICIOUS

PDF

58.3 KB Created: 2020-08-03 20:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28148f8b16f84cfe85b18cb38b5ff35e SHA-1: c95090382c21ee76a76eee86df5d323262a95975 SHA-256: 3d939a27b8a8d91abb8bdd83c2a7a1f22b0cad9d15130d9a7cefda4a0d0749e1
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'https://ttraff.ru/pify?keyword=pmp+braindumps+pdf'. The document body, though heavily obfuscated, contains this same URL and mentions 'Pmp braindumps pdf', suggesting a lure to entice users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=pmp+braindumps+pdf
    • http://files.abqyav.com/uploads/1/3/0/7/130776104/5345679.pdf
    • http://files.nutritionworksri.com/uploads/1/3/0/7/130739288/642624.pdf
    • http://files.kalenit.com/uploads/1/3/1/6/131606875/737dec0f0.pdf
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/xorogovobexuvefikotol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/83176739704.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/lefota.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/fekivorujevojadeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3106/7813/files/lanovosawowozebepukudo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9712/9109/files/xubufodojina.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6949/files/wagisironov.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5883/files/jawokewibu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.pdf
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/64163708668.pdf
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/backyard_baseball_2001_mac_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/zaxawixobil.pdf
    • https://cdn.shopify.com/s/files/1/0440/9131/0232/files/govenivax.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_off000082b0.bin
ee6e18e23581dec4b60cae7b2409a31577b904adc1ba75057a436f346da92a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B0 4872 bytes
font_01_sfnt_off000092f8.bin
b90ef7d35d8260f9453fe9d0e8a95d50b392206cfc48a7342400b2304a7229b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F8 11144 bytes
font_02_sfnt_off0000b904.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB904 16144 bytes
font_03_sfnt_off0000ce05.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 4324 bytes

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