Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9828d30d3812fec…

MALICIOUS

PDF

49.3 KB Created: 2020-08-17 06:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d004f2a6946142d4764d2392eebf2022 SHA-1: 737fc9ddfd845e66bef991601c819fc82148367c SHA-256: b9828d30d3812fec9e5208d483b70ea8633642a6ee5d27ebbdf84c95264d751d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as an episode guide. This suggests a phishing or social engineering attack aimed at directing users to malicious content. The ML classifier also strongly indicated maliciousness.

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=kraft+music+hall+episode+guide
    • http://files.edinburghtabletennis.com/uploads/1/3/1/0/131070160/napuvunagasunok.pdf
    • http://files.wathsportsfan.com/uploads/1/3/0/7/130739524/382fcf7811b.pdf
    • http://vamek.pannypointcondo.com/uploads/1/3/1/4/131406744/1f04331d.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/55347724693.pdf
    • https://cdn.shopify.com/s/files/1/0432/2584/1819/files/irelia_guide_9._22.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/29239016249.pdf
    • https://cdn.shopify.com/s/files/1/0432/4360/2080/files/le_barycentre.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/fujodudavekopupaso.pdf
    • https://cdn.shopify.com/s/files/1/0450/5042/9598/files/electricity_and_magnetism_purcell_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/kurajuxazugotisarepu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/java_language_basic_concepts.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/intermediate_accounting_spiceland_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/boomslang_platform_pedals_weight.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7494/files/weather_moscow_idaho_hourly.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_off000073ec.bin
21facc65effbbb674cb9e16ba928a2e7a4fc8e711d9e1bb853a6c34116554320
pdf-font-stream PDF embedded font (sfnt) at offset 0x73EC 5536 bytes
font_01_sfnt_off00008696.bin
8041f4b303badf6ecc59a8b5df65b383fa5cfd927552004166b17bd23c32cce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8696 15940 bytes