Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab8a96d1347426e…

MALICIOUS

PDF

37.1 KB Created: 2020-08-11 03:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6dc3481d40926fe8533ecf3258cae8d SHA-1: 121abad310a40883de7f8629d1c68fd7d0a7e037 SHA-256: 7ab8a96d1347426e8ba9cbc8f8da394f3bc790aafd4f2e9ef16cf47c92a0ee96
152 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a piano solo PDF. The link, https://ttraff.com/pify?keyword=careless+whisper+piano+solo+pdf, points to known malicious infrastructure. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier 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.com/pify?keyword=careless+whisper+piano+solo+pdf
    • http://files.macroleaders.com.au/uploads/1/3/1/4/131437222/kofimibusime.pdf
    • http://files.ajeplanners.com/uploads/1/3/1/4/131406816/sifojopese_nidukuzinagimo_xutokajofuzi_roxurugar.pdf
    • http://files.taylormadebling.com/uploads/1/3/0/7/130776218/forutuvuzoxi.pdf
    • http://files.glitznglamonline.com/uploads/1/3/2/3/132303013/leratokelure.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1781/files/selanutuvegerune.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/76492363198.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/somixuraze.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/xotuxapopobotuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/jusoperefimosepekow.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/1393350377.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/damivizudat.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/wofusekenelegebibilebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/demuvuzow.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/pubikilojaxegoxojexujun.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1033/files/jee_maths_formulas_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/james_stewart_calculus_solution_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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048e6.bin
89f211a967de8a13401b35b9f3dac40fef6167e2371826bbe61d4a68ccc8dc2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x48E6 5128 bytes
font_01_sfnt_off00005a5e.bin
881b3433d4bcc826dd6cd16d78e10a6dcc1d4debc7b8f2571590088c3d14b382
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5E 13572 bytes