Malicious PDF — malware analysis report

Static analysis result for SHA-256 898caf06d86c5edd…

MALICIOUS

PDF

46.0 KB Created: 2020-08-08 05:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdc25b830afbf686c483d6fa21dd2155 SHA-1: 6a46d4af252b5d0b09c3b28d0a87f420d1473f68 SHA-256: 898caf06d86c5eddc9bbd4c0f83436af69b5c7f6029049782201af6b4fc35fd2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=exceptional+learners+textbook+pdf'. The document body, though heavily obfuscated, also contains this URL and other links pointing to PDF files hosted on Shopify. This suggests a link farm or redirection strategy to distribute malicious content or phish users. No scripts were extracted from this sample.

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=exceptional+learners+textbook+pdf
    • http://files.scrantontennisclub.com/uploads/1/3/1/6/131637178/8631895.pdf
    • http://wosad.guzmansdancestudio.com/uploads/1/3/1/4/131452883/19f6827bf3bb5.pdf
    • http://files.mytoepro.com.au/uploads/1/3/2/7/132740930/82e39d61.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/tawowovulixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/tubiwirugavalu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5794/files/shenkuu_lunar_temple.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7841/files/gju_msc_math_notes.pdf
    • https://cdn.shopify.com/s/files/1/0438/2395/6125/files/batamajukepa.pdf
    • https://cdn.shopify.com/s/files/1/0447/8844/9437/files/blender_3d_cycles_rendering_engine.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/19963159445.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/6344116355.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/2006_honda_rancher.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/tatemamaketazapu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6257/files/nagak.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_off0000668a.bin
484b1dedae9ba19e4b900333c759913b1310a1faa3d4c784530088c2c0160207
pdf-font-stream PDF embedded font (sfnt) at offset 0x668A 5164 bytes
font_01_sfnt_off0000780d.bin
9856172d58096893cda0bbe921a2cfe18c79a03ea7c0435080ad332e319dad3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x780D 10928 bytes
font_02_sfnt_off00009d2a.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2A 4324 bytes