Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4949e2c0c2acff…

MALICIOUS

PDF

45.7 KB Created: 2020-08-21 12:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c624ccc9afa51976199cb7a92b163659 SHA-1: c7f8958b8885fe32e6ff0647a125cf19d20815ac SHA-256: 7e4949e2c0c2acff1900c0b7df73729bf68e8bef23b64cfa67299fb76a295793
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identifies this as a PDF link farm, suggesting a potential SEO manipulation or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the sheer volume of links and the malicious redirector point to a delivery mechanism for further malicious content.

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=backhaul+definition+information+technology
    • http://bilore.yogasutrasouls.com/uploads/1/3/1/8/131856877/bb45df4a8.pdf
    • http://files.peacefulkidsclasses.com/uploads/1/3/2/7/132740606/boxupixewagaku-niboted.pdf
    • http://dubokirat.andymacdonaldmusic.com/uploads/1/3/0/8/130813979/fosujam.pdf
    • http://files.conjunctionmedia.com/uploads/1/3/1/4/131437983/jumeferavesij.pdf
    • http://files.hamptonsgarage.com.au/uploads/1/3/0/9/130969083/b6d578bdef4cc2f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/katyusha_sheet_music_accordion.pdf
    • https://cdn.shopify.com/s/files/1/0432/2040/2336/files/antistaphylococcal_antibiotics.pdf
    • https://cdn.shopify.com/s/files/1/0435/6803/8049/files/12923456624.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6564/files/juvamafakip.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/desuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/jozikewexatarigojagizul.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/35854177138.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/delixeva.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/tibixejofopasamebuvi.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_off0000741a.bin
174e22ea0d1598778c7e386986c86a605d8753d3b8eb7c9920dd8cda3acd32f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x741A 5472 bytes
font_01_sfnt_off00008684.bin
94711912b4bd3dcefa1e9030097eee9602e693be138dbb229bd8a5457879626a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8684 10160 bytes