Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cf537c3e1399a7…

MALICIOUS

PDF

45.6 KB Created: 2020-08-19 08:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83817ee4baf9c8cc8bb32253bd87fc99 SHA-1: 98bd3b242151edb13ccc6ba77f8c4f1c7bf14a6e SHA-256: 16cf537c3e1399a7ffd446ba0e21c674ed354479e277ac5b94389a090de0e483
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=glue+styrofoam+sheets+together' which is also listed as a malicious redirector. This suggests the primary function is to lure users to malicious sites.

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=glue+styrofoam+sheets+together
    • http://files.peterliuvocals.com/uploads/1/3/2/3/132303071/3262ae24.pdf
    • http://suniworek.absolute.technology/uploads/1/3/0/7/130775506/valudapoge.pdf
    • http://batufa.carolinepaltinphd.com/uploads/1/3/0/7/130738850/3261785.pdf
    • http://rabamu.pq-review.com/uploads/1/3/2/3/132303245/37afb66dc0cbc3c.pdf
    • http://files.alliancecounselingservices.org/uploads/1/3/1/4/131482886/1318606.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8867/4967/files/wowidalodisobexididen.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/annotate_surface_pen.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/bellyache_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/8094/0709/files/gopobipabegulesididenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/segiminikapi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1400/files/kalnirnay_august_2020_marathi_calendar_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/digotigojemajodonidali.pdf
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/detukimoxadelolemezas.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/zavuzatobapiwomunetamajeb.pdf
    • https://cdn.shopify.com/s/files/1/0440/2891/9973/files/12725380779.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4354/files/vumes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5449/0012/files/84927402040.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0040/files/tovezotusuvujakudubenem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/gemsy_sewing_machine_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007418.bin
83c83e5e29bd8a6c1ce3ae8fed92d2f296c78b06f069b9bf752f5d945505c5fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7418 5312 bytes
font_01_sfnt_off0000860f.bin
87d70da415e250fc6d7205e83fc869b88d77a72024026da29d2174b2c643b1eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860F 10176 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.