Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f4ae066c8fb774…

MALICIOUS

PDF

45.9 KB Created: 2020-08-17 16:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f173cc2ccccb0c504853488ae173fabb SHA-1: 9567ee001ce95f649369df971873c8da7a89e081 SHA-256: 52f4ae066c8fb774b8c960c62136c1d11e054b5a92c6e4c9a3a3eebe34dd9557
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one pointing to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text suggesting it is a worksheet, likely a lure. The presence of a link farm heuristic further indicates a malicious intent to redirect users to potentially harmful content.

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=neuron+diagram+worksheet+pdf
    • http://files.alternativeaccountabilityforum.org/uploads/1/3/0/8/130874110/1604622.pdf
    • http://files.projectyouthextension.com/uploads/1/3/0/7/130740231/25f5e1587a.pdf
    • http://files.wilcoprevention.org/uploads/1/3/1/4/131437740/29b296.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/rivoposufewajixifedaferu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/84108063931.pdf
    • https://cdn.shopify.com/s/files/1/0440/2987/0230/files/64142697880.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/zapow.pdf
    • https://cdn.shopify.com/s/files/1/0433/3358/2998/files/40038667368.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3589/files/86214537192.pdf
    • https://cdn.shopify.com/s/files/1/0440/1109/4174/files/sivexenugegorejuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/5578/2819/files/jaresituxotuxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/2678063582.pdf
    • https://cdn.shopify.com/s/files/1/0431/3939/9842/files/60009090667.pdf
    • https://cdn.shopify.com/s/files/1/0437/1772/2280/files/richard_clayderman_mariage_d_amour_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/1711/7589/files/wazapowedevoxuzo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066cd.bin
be9c562de9558e12ad83940340d8d25229897fe89c27603c56a5c74f14eef1c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x66CD 5432 bytes
font_01_sfnt_off00007936.bin
93c98eb74252d5df2a3c5bb245817483ab0da06af7783a5aef396fa3a09636ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7936 10352 bytes
font_02_sfnt_off00009c98.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C98 4324 bytes