Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c089c28bdcf654e…

MALICIOUS

PDF

46.1 KB Created: 2020-08-31 01:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e34caad2cef8986230454b27f75e4c SHA-1: e6309353cd7197949cf7bdf24260fc35185572cd SHA-256: 8c089c28bdcf654e5908324c1b72f91edaf6f11ebc169784af433d151072d2d3
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious domain, disguised as a download for an iPhone manual. This indicates a social engineering attempt to trick users into visiting a harmful site. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URL and heuristic firings are sufficient to determine the attack pattern.

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/wix?keyword=download+iphone+6+instruction+manual
    • https://static.usrfiles.com/ugd/45e30f_a3a6f3fc3d9041f3896b0fc5efad229a.pdf
    • https://static.usrfiles.com/ugd/1be480_6f3e47db58f54349b6fb085ae011bbcb.pdf
    • https://static.usrfiles.com/ugd/a838c0_8b8815c1210f4f5ab8fb41561c4a26a2.pdf
    • https://static.usrfiles.com/ugd/2f07a1_f0c31fb816da49a78e8fc8c1783b29fc.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_26df5e1ce26e45c9836b5eabd222ad80.pdf
    • https://cdn.shopify.com/s/files/1/0431/2717/7380/files/php_ini_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/48994731299.pdf
    • https://cdn.shopify.com/s/files/1/0434/6272/1688/files/govaguvajewise.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/29193324384.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/galactic_civilizations_iii_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/0558/1211/files/bony_to_beastly_program.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/kozokurajo.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_off00005d57.bin
49c02e3793ee7b572d91d5d5202d494330144fcf272f3c6d199ff84eb6881eba
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D57 5440 bytes
font_01_sfnt_off00006fb9.bin
e00defcb847251dcbe3dac30fe52b255e152cc730711af649bd2c02f96f7a67f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB9 14864 bytes
font_02_sfnt_off00009dcb.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DCB 4324 bytes