Malicious PDF — malware analysis report

Static analysis result for SHA-256 39315cf8017ff6a3…

MALICIOUS

PDF

47.5 KB Created: 2020-08-06 12:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb21209ef4f1e3326888e0e354dac756 SHA-1: 900d3709f1e8a84b39ceebb876b5c251e2da694a SHA-256: 39315cf8017ff6a336e8de8211933c620222c3f0f9908f9c2a39a1e8df7d4863
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, with the primary link directing to a known malicious redirector. The document body, though partially corrupted, contains text related to learning French and the URL itself, suggesting a lure to entice users to click the malicious link. The ML classifier strongly indicated maliciousness, and the presence of numerous links points to a link farm or redirection strategy.

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.cc/pify?keyword=aprender+frances+con+pronunciacion+escrita+pdf
    • http://files.pawsitive-dog-training.com/uploads/1/3/2/7/132740377/6fd1ba.pdf
    • http://files.lovingtonfire.com/uploads/1/3/2/6/132695663/fosogedawajirobax.pdf
    • http://files.nod-production.de/uploads/1/3/0/7/130776118/3864674.pdf
    • http://files.callieraebowtique.com/uploads/1/3/1/8/131857758/fcade0e16cff3d.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/surat_al_kahfi_latin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6807/1836/files/75223527653.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/5221870582.pdf
    • https://cdn.shopify.com/s/files/1/0432/7555/0876/files/kanajuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/classification_of_african_languages.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/various_forms_of_energy.pdf
    • https://cdn.shopify.com/s/files/1/0432/8246/4928/files/5263752914.pdf
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/leropepuzimofir.pdf
    • https://cdn.shopify.com/s/files/1/0438/4201/1293/files/geometric_sequence_kuta_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7998/2492/files/pool_of_tribute_extreme.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/98351018510.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_off00007530.bin
d016b123daa61377a95ff7bdf271da632a3fac0b72e21d71b8105ec5b230ed57
pdf-font-stream PDF embedded font (sfnt) at offset 0x7530 5104 bytes
font_01_sfnt_off000086a1.bin
9c64457b39422828dd1dda94ab88318ace168267cebb5220f4504dc0cd64e88c
pdf-font-stream PDF embedded font (sfnt) at offset 0x86A1 12920 bytes