Malicious PDF — malware analysis report

Static analysis result for SHA-256 7add1b872f548627…

MALICIOUS

PDF

40.3 KB Created: 2020-08-20 13:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cefd7b75f3d49d7586dc22a9facf7422 SHA-1: 2bf971f0e7d7bb96682b4fee6f57edfcfdc0f8df SHA-256: 7add1b872f54862735451a5906ff8628888de4728baee312c99fb67e53832ac4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. The primary link, 'https://ttraff.com/pify?keyword=galvanized+iron+sheets+have+a+coating+of', is identified as a malicious redirector. The document body, though partially corrupted, contains text related to galvanized iron sheets and the authoring application, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=galvanized+iron+sheets+have+a+coating+of
    • http://files.cityofadamsoregon.com/uploads/1/3/2/6/132695832/panuveza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0374/8263/files/temesazova.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/83658649536.pdf
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/zuxubeviwumaluruwuxotug.pdf
    • https://cdn.shopify.com/s/files/1/0433/3230/5054/files/jaxadaki.pdf
    • https://cdn.shopify.com/s/files/1/0460/3235/5492/files/83976297040.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2564/files/pt_serif_pro_caption_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9735/files/62488483183.pdf
    • https://cdn.shopify.com/s/files/1/0438/4122/4869/files/tuberculous_meningitis_complications.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/30310409537.pdf
    • https://cdn.shopify.com/s/files/1/0433/6448/3240/files/64498349131.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/43157083007.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_off00005f93.bin
97661a4aeeb947617d96d4866230e9004371655fc6a19aa3155a6a77254395d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F93 5424 bytes
font_01_sfnt_off0000720f.bin
30cb60d1e460e43fcd8df45430a0ffb027301cae3a68e508e4984babcf6b02f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x720F 10092 bytes