Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb887891dfde3d19…

MALICIOUS

PDF

45.2 KB Created: 2020-09-18 08:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 121341c9e286cf4b93e3cf96c2a59979 SHA-1: 4faadd047a7aea0c4ff58a17ad114378c588681e SHA-256: fb887891dfde3d19e29f1a540cd7669b59a33b9ce5b9be59889859c576206231
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a page offering cracked software, indicating a lure for potentially unwanted or malicious downloads. The presence of numerous other links, many pointing to file hosting services, suggests a link farm for SEO poisoning or distribution.

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.club/wix?keyword=hotspot+shield+elite+4.2.5+apk+vpn+proxy+cracked+full+unlocked
    • http://lafaz.shortages.net/uploads/1/3/1/4/131437987/2918903.pdf
    • https://ab888b9d-dc70-4c4b-96b0-bbfffbdd6122.filesusr.com/ugd/3e5db3_6625136eade4432388fd535dce7268b7.pdf?index=true
    • https://9a8380fe-5ad7-4891-80cf-19cd195a6b66.filesusr.com/ugd/b77b08_1b560efa9a8a4b3bab5fa32976738496.pdf?index=true
    • https://72b311f6-6ad0-4553-8c1a-22ca14bb39eb.filesusr.com/ugd/6cabbb_6def86fad4e9418a88b4392a2ba7b990.pdf?index=true
    • https://0de9b8be-9891-46f7-840c-1e4941d0516f.filesusr.com/ugd/1c8c1e_56eefd8bcfc2466c8d557cb57aa8069a.pdf?index=true
    • https://bd5148f0-d413-4712-8388-8336042f8748.filesusr.com/ugd/2eec94_8a6fd2acfa3c4fce854d18899611684c.pdf?index=true
    • https://67080a95-82c3-4950-899d-fe02a2a26158.filesusr.com/ugd/4fb05f_cff942a5198b44f692a1ab7df20013e7.pdf?index=true
    • https://0374fd26-f12e-4785-8d59-0bcf562d47fd.filesusr.com/ugd/cdfdba_249e7a334d0440e1818290d048940d91.pdf?index=true
    • https://d034a908-ab77-42e4-b8f6-17be673493fb.filesusr.com/ugd/8a4248_5ce323d8d2af41b087ddbe0669e36d21.pdf?index=true
    • https://ea7f6f7b-ee76-4982-9ac8-70fca99af599.filesusr.com/ugd/96564c_ae73b14d109a47a0bfc81efd33e7e8dd.pdf?index=true
    • https://06ed311c-49d9-4df6-8777-07d489bca3c1.filesusr.com/ugd/9734e7_bd091d48469e4fcf8bfa11fe9314ca49.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061af.bin
6ff8f6633f1ed6ac7e52638a6b2c59a8e231fe4b808c07ae1cb4956844ce1a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AF 5756 bytes
font_01_sfnt_off00007554.bin
b7c1a6f67eaaec99adc6ff7c3f8b8c0007799971655aef02ee32b8d643fc56c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7554 10488 bytes
font_02_sfnt_off0000993e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x993E 4324 bytes

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