Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f8d9a8b99c71ce…

MALICIOUS

PDF

50.8 KB Created: 2020-08-25 16:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e073c289e472b9c1252266ec76c8296 SHA-1: 34f60ee17114258248161ce394d607fde824a1dc SHA-256: d4f8d9a8b99c71ce5f1178e375d84bac633141276fd23f6655c15e4a123a0eea
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell 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.ru/pify?keyword=opencv+augmented+reality+tutorial+android'. The document body, though heavily obfuscated, contains this URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. 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.ru/pify?keyword=opencv+augmented+reality+tutorial+android
    • http://padurotut.incubator143.org/uploads/1/3/1/3/131379394/4068087.pdf
    • http://pikitin.goodnote.ca/uploads/1/3/0/8/130814328/kuferogo.pdf
    • http://dafolev.smokeandhoneylocalproducts.com/uploads/1/3/2/6/132682052/tuwitobivoj_jusixodul_xodujazadita_wotagarasom.pdf
    • http://files.scenicrimoptometrists.com/uploads/1/3/1/4/131407315/zikusuwe.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/temperature_sensing_devices.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/mewebepumuriwokel.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2229/files/zipukas.pdf
    • https://cdn.shopify.com/s/files/1/0429/6831/8105/files/kovetixekiviruzoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/parallel_lines_worksheet_algebra_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/71808694801.pdf
    • https://cdn.shopify.com/s/files/1/0431/7344/5788/files/12094822563.pdf
    • https://cdn.shopify.com/s/files/1/0447/9585/4997/files/blitzer_algebra_and_trigonometry_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/4809/8209/files/selozag.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/diwali_festival_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0450/4210/6518/files/municipal_solid_waste_to_energy.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_off00007ff8.bin
40e5a084e27bac09147ab66e3060bf4a91fffa218749107ab0a52cd76751ee44
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF8 5404 bytes
font_01_sfnt_off00009247.bin
60114d74f3c46c9e505d3c8183860366d2edd80e2c97886d16ecc87e83679245
pdf-font-stream PDF embedded font (sfnt) at offset 0x9247 13868 bytes