Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef30d4b766b9cfed…

MALICIOUS

PDF

46.2 KB Created: 2020-08-24 02:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36c56127b4e66e4b570dbf72cbbcc452 SHA-1: f01ee0a5bcf13a22eac1f55f70edf0cbf94ae96e SHA-256: ef30d4b766b9cfed466aa0bf8b7bb18e7f160ed3049cb0ab68f9cac5a79aa50d
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'call recording app for android free' and the malicious URL, suggesting a lure for phishing or malware download. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms a malicious intent to direct the user to a harmful site.

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=call+recording+app+for+android+free
    • http://files.nassaucountynyhomes.com/uploads/1/3/0/8/130814466/furidebemivif_lileruvoxewenaj.pdf
    • http://files.lovepositivecounseling.com/uploads/1/3/1/4/131453415/438833.pdf
    • http://files.ksharp1.com/uploads/1/3/2/6/132682913/2e6cafea76ed99.pdf
    • http://ropaseken.uhsbe.org/uploads/1/3/0/7/130776791/kibejosudazad-kefujesal-fipijozunerodad-bawoxer.pdf
    • http://files.stellamichaels.com/uploads/1/3/2/6/132695714/kanavodezemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/28501511136.pdf
    • https://cdn.shopify.com/s/files/1/0433/0877/7637/files/19679753853.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/xokoruxuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/65682315310.pdf
    • https://cdn.shopify.com/s/files/1/0428/7440/5023/files/49079181628.pdf
    • https://cdn.shopify.com/s/files/1/0431/4834/5500/files/xoxazazalidubopuduzav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/zijurogefalubufisuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/55324394255.pdf
    • https://cdn.shopify.com/s/files/1/0441/3833/2312/files/30287411136.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/40511076570.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6566/files/amma_songs_starmusiq.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/56329429182.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_off0000760f.bin
7b3fdba1e6a796c867b9599a0dccd2d53c93c58f1a1342f7f47c46fb9e0c3208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760F 5048 bytes
font_01_sfnt_off00008748.bin
72c0ad6ad8a6d8e2bb57202fe7dd79445752c682f732eb2f5d7b4c3b3a90452f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8748 10600 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.