Malicious PDF — malware analysis report

Static analysis result for SHA-256 81663b365d467a24…

MALICIOUS

PDF

50.5 KB Created: 2020-08-09 01:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fbdf7a24e1762159d749604b2260d4c SHA-1: ed0508bc9a4fd75beb9268b2a3de0f6b18d6a175 SHA-256: 81663b365d467a2410b06d965fe743ffd141ff6160296fbae5f6697dd751333d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a Bluedio manual. The document also hosts a large number of other PDF links, many of which point to Shopify domains, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier strongly indicated maliciousness, supporting the presence of malicious links.

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=bluedio+tm+manual+pdf
    • http://files.tameraboundsforcitycouncil.com/uploads/1/3/1/4/131453395/luwuxufanez.pdf
    • http://files.laurenratcliffe.com/uploads/1/3/1/3/131380445/fa6700ee.pdf
    • http://zetugu.cnyshotgun.com/uploads/1/3/0/9/130969204/nugaraxuzoroli.pdf
    • http://mefip.mcleanwomansclub.org/uploads/1/3/1/6/131606027/liberamewuwexib.pdf
    • http://files.phase3security.com/uploads/1/3/1/4/131409508/kewavimefaxalun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/70206921038.pdf
    • https://cdn.shopify.com/s/files/1/0447/9696/9109/files/uninstall_vmware_fusion_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/86672717747.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/54097160892.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/300_accords_guitare.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/karakteristik_bakteri_enterobacter.pdf
    • https://cdn.shopify.com/s/files/1/0429/0736/9639/files/677054570.pdf
    • https://cdn.shopify.com/s/files/1/0439/2960/0155/files/free_glitter_fonts.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/xomitexinijuropebakuvuzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0870/files/selev.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_off00006435.bin
2618c9c01aecf529a51c55aa3ae8431d3bb96b4431b7ea902b56b8f461ec724e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6435 2948 bytes
font_01_sfnt_off00006eb4.bin
2b09ebb7e7f4ac8668f1803ac77a661e224a45ba19137fb61a5079c8610404ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB4 4964 bytes
font_02_sfnt_off00007f89.bin
7220bcc72999823faa640364177024273283c4c5a9f4f5f206793ec564ace132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F89 11552 bytes
font_03_sfnt_off0000a748.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA748 16164 bytes

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