Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d789cb60655a75f…

MALICIOUS

PDF

51.2 KB Created: 2020-07-21 00:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d0f58502c69adddd3931be874391289 SHA-1: 812cf887a12036291dacbf03dc2d7cf1bcb818e0 SHA-256: 1d789cb60655a75f0a7fea5de41d6d4b79e439b66fbce7e90a34762a699f56c3
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 link farm hosted on cdn.shopify.com, designed to appear as legitimate documents. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.ru/wb. This suggests a campaign to drive traffic to malicious sites through SEO-poisoned PDF documents.

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.ru/wb?keyword=neoplasias%20malignas%20definicion%20pdf
    • http://files.lccgsmt.org/uploads/1/3/0/8/130874381/matilejaseja_sodumugutipo.pdf
    • http://files.livelikelove.net/uploads/1/3/1/4/131437701/4410130.pdf
    • http://files.negsbestthing.com/uploads/1/3/2/8/132815961/riwemuto.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/4046851466.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/zipine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94215193789.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/goguravedigevonatezi.pdf
    • https://nanesezup.files.wordpress.com/2020/06/notajabaloxofepav.pdf
    • https://pusetojax.files.wordpress.com/2020/06/zozasawi.pdf
    • https://leforav.files.wordpress.com/2020/06/nedejuxokexokezopu.pdf
    • https://nogonig497746126.files.wordpress.com/2020/07/10246196975.pdf
    • https://zosifasagul146255057.files.wordpress.com/2020/06/xosapuwobusenedi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/zikelo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/73323545843.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/tafigikadipajegokutuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/nelipew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0626/files/4931575102.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/todimimujofovovudodiru.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_off00008967.bin
9429c40d24236c9e64ca386945442ce47071372a36dbfdd83083679d57212d00
pdf-font-stream PDF embedded font (sfnt) at offset 0x8967 5056 bytes
font_01_sfnt_off00009a85.bin
b9100e53549484a35881461f317fcae0d28ff1f16dd7506cf0ac9662c12a58fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A85 10660 bytes