Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bac42e7ee9d1540…

MALICIOUS

PDF

44.9 KB Created: 2020-08-03 12:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11eb6583b0f3cbbea38718da175408b4 SHA-1: 257543ace9461ca4b31fd1111812fbcafa294653 SHA-256: 1bac42e7ee9d1540c86c735312bb688199fd486d09f33862eeef70f7d437f89a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of the malicious redirector URL and the link farm heuristic strongly suggest the intent is to drive traffic to malicious infrastructure.

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=ishikawa+diagram+pdf
    • http://files.reachwaupun.org/uploads/1/3/1/4/131454521/lejefuwavesaxobexu.pdf
    • http://zilataf.kingdomdetail.com/uploads/1/3/0/7/130776791/2590339.pdf
    • http://files.chicagolandboxers.com/uploads/1/3/0/7/130775085/desotivotasitepuli.pdf
    • http://files.shineeventdesign.com/uploads/1/3/2/7/132712514/vepatusunoto_pexaru_fefajosujemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/24635847228.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/34089085991.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/mitsubishi_electric_ac_remote.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/76499021874.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/pobixaxamigovobad.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/water_resources_engineering_wurbs.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/62116242183.pdf
    • https://cdn.shopify.com/s/files/1/0439/3094/3643/files/36927464496.pdf
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/wojinudowarisutox.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/kulezevudelixo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4596/1383/files/96129414036.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_off00007104.bin
f02e4d346175d8b39cef7c8eb85bbcead7899cee6a3ed46686b7b6beeb25de88
pdf-font-stream PDF embedded font (sfnt) at offset 0x7104 5516 bytes
font_01_sfnt_off000083b0.bin
e73d5e83fa5034c16375d5912a1aea513cd5c0520b38b01dcd28a4d456f2d77a
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B0 10460 bytes