Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64ef14f7f2b94eb…

MALICIOUS

PDF

42.5 KB Created: 2020-08-23 18:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad306cb0847da4c8db1474bf880698e SHA-1: ce3f070c2e04e9bce7c78108e66d0b350b483ad4 SHA-256: e64ef14f7f2b94eb85ce79a9f24b5e3169072266fdeec67e834cf932e7a59944
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=hotstar+apk+free++new+version`. The document body also contains text related to 'Hotstar apk free new version', suggesting a lure to download potentially malicious software. The ML classifier strongly supports the malicious verdict.

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=hotstar+apk+free++new+version
    • http://files.angyhall.com/uploads/1/3/2/6/132682022/mivukopedem_dazivugugoses_mekoxazoname.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/endnote_x7_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/ap_computer_science_exam_reference_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/2638/0960/files/bafg_antrag_hannover.pdf
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/78583640275.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/rupilogiwisiforol.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9319/files/bacteriostatic_and_bactericidal_antibiotics.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2034/files/vobuvixi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/82954375765.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/william_wilson_edgar_allan_poe_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1461/files/8189656311.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/pusojejapugalire.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8892/files/64521099656.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_off00006811.bin
62b4a46194553e1586f26f438b17125304b5d06833fe39302bcf1428d1504da2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6811 5040 bytes
font_01_sfnt_off00007965.bin
954e773af1f40ef09db2fbc827ce34a39cd0f18617902240f4a735970d4b6337
pdf-font-stream PDF embedded font (sfnt) at offset 0x7965 10668 bytes