Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00af8ef095895ac…

MALICIOUS

PDF

43.8 KB Created: 2020-08-20 22:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c471c1775e1a4cc2701a08d60711a1 SHA-1: c827c896cf66c31c5f34f55e3f62dc791b06b407 SHA-256: a00af8ef095895ac5ec659c8a203877174895284aad4cd661288b288dce6d3d0
152 Risk Score

Malware Insights

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

The PDF contains a deceptive message about an authentication error to trick the user into clicking a link. The primary malicious URL, https://ttraff.com/pify?keyword=authentication+error+occurred+android+wifi+samsung, is identified as a redirector to malicious infrastructure. The document also hosts a large number of other PDF files, likely for SEO poisoning or to obscure the malicious intent.

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=authentication+error+occurred+android+wifi+samsung
    • http://files.muslimgirlsfence.org/uploads/1/3/1/6/131606537/64df5a2.pdf
    • http://bulaza.iproclaimit.com/uploads/1/3/1/6/131637254/73cb1ef4e.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/vubinex.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/reroxaniw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6563/0102/files/missing_411_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/2500628829.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/orioles_2020_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/gededesalomutamut.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/mipexegidowik.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/hindu_predictive_astrology_free_download.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_off00006e01.bin
aa93d738eac6552bcbb43c9ebf7e197a60d7290a9b94854cadedd83962fb92a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E01 5484 bytes
font_01_sfnt_off00008087.bin
3cc7f16041164d1cea7eff6e45ca367d9137c9d84b03dc41c8dd38244dcd9046		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8087 9960 bytes

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