Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eb67d2ce5abb01…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 04:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9a99a831fe04b4cb2808411a57b113a SHA-1: 93978783d2155c303f7f3b7e56a4e040fcced00e SHA-256: 85eb67d2ce5abb01ba261f28d9ab1660641007ca5c7b55c3fdd2126887ee2762
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'https://ttraff.cc/wix?keyword=hushsms+apk+old+version', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to 'hushsms apk old version' and the malicious URL, suggesting a lure to download potentially harmful software. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=hushsms+apk+old+version
    • https://static.usrfiles.com/ugd/b8c837_e6f84af0b08f4bcdb4f3f152bb374db5.pdf
    • https://static.usrfiles.com/ugd/58a813_97db8c9ecc954088bb377665d4a37217.pdf
    • https://static.usrfiles.com/ugd/9c43ec_02e47489f3d94d0595de8be4dfedf538.pdf
    • https://static.usrfiles.com/ugd/b8c837_8012811e613d4442b9bae7f5fa8b8c84.pdf
    • https://cdn.shopify.com/s/files/1/0439/9572/5982/files/mimadiwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/bixanikutogeriko.pdf
    • https://cdn.shopify.com/s/files/1/0438/8398/7096/files/bluetooth_barcode_scanner_android_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0434/3866/9976/files/21767071000.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd4141fcf85948148f7b269342f39ab0.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb337cc5f30340fc93be43de54c95934.pdf
    • https://static.usrfiles.com/ugd/b7ab08_40b3441224034b11add90f167a0c69f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e2aacc39c9b4d2cb4a4ad025b9efbc1.pdf
    • https://static.usrfiles.com/ugd/b8c837_eea862f89f4e476b905f8d61a6bb3ff7.pdf
    • https://cdn.shopify.com/s/files/1/0434/5092/5223/files/action_bar_hide_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/molemenovir.pdf
    • https://cdn.shopify.com/s/files/1/0434/4083/2678/files/91282570889.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_off000063fc.bin
df5818383ba248846e731bbdf8f28cbb451de1c37eb1928ed2646c81687f933c
pdf-font-stream PDF embedded font (sfnt) at offset 0x63FC 5284 bytes
font_01_sfnt_off000075cc.bin
42f16a463e9c2d7d6b86ea17ac1627425f80164e21a731f233d58170e81e9541
pdf-font-stream PDF embedded font (sfnt) at offset 0x75CC 10200 bytes