Malicious PDF — malware analysis report

Static analysis result for SHA-256 49aeaf81a79b2801…

MALICIOUS

PDF

41.3 KB Created: 2020-09-07 17:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17ce99af145f94c5893804914fc1ea61 SHA-1: 3b99c8ee40a115db3afd06e361b48b2e30fcca82 SHA-256: 49aeaf81a79b2801c37932b182c38972f483ae3d61de979a86b5e5b2b6d7f363
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate content, but ultimately redirects to a malicious URL. The primary malicious URL identified is https://ttraff.me/wix?keyword=bixby+home+apk+for+any+android, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links to PDF files hosted on Shopify and usrfiles.com, suggesting a SEO-based lure to drive traffic to the malicious redirector.

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.me/wix?keyword=bixby+home+apk+for+any+android
    • https://cdn.shopify.com/s/files/1/0434/7835/2022/files/62964535680.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/wejeve.pdf
    • https://cdn.shopify.com/s/files/1/0464/7308/5078/files/bajirao_mastani_full_movie_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5881/files/mavisomus.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/30282575810.pdf
    • https://static.usrfiles.com/ugd/696b8a_ef52b200be6948d1a5666f6ba7851be2.pdf
    • https://static.usrfiles.com/ugd/5be868_b15380b18a334c45b5eb00f4fb10eb69.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/42393851179.pdf
    • https://cdn.shopify.com/s/files/1/0439/2720/8091/files/adb_bypass_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3749/files/sojuvipavasilawuz.pdf
    • https://static.usrfiles.com/ugd/9ef0c3_24f0e8ce489143fc860702a789ba5e01.pdf
    • https://static.usrfiles.com/ugd/98e2de_43bab5cb02ab49a6a29bc888331f57b7.pdf
    • https://static.usrfiles.com/ugd/c722c2_2e23c311bba3429aa8e766161faaa907.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006541.bin
0f547c4b2d95dec51b9627273727898ada90e190d246cdc28c3c81ca4a55bd88
pdf-font-stream PDF embedded font (sfnt) at offset 0x6541 5492 bytes
font_01_sfnt_off000077cb.bin
96fcc891afe3da109e1b88786f99c7298c4a377e9e3909d5369baaa7a7d9b152
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CB 9500 bytes