Malicious PDF — malware analysis report

Static analysis result for SHA-256 047e6b256494d5f5…

MALICIOUS

PDF

51.9 KB Created: 2020-09-02 16:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf29811adeb4ba069c1dcef8209ef5e3 SHA-1: 7e53196198149d6e62c346646e4d0c9807c05e72 SHA-256: 047e6b256494d5f5fe32a2502e2cf7a566e57be2f98a445fc6c9b0f4604ab416
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm of 22 external PDF documents, with the primary link pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm. The document body, though obfuscated, contains the malicious URL and references to other PDFs, reinforcing the lure. No scripts were extracted, but the presence of embedded URLs and the link farm structure suggest a phishing or redirection attempt.

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=song+basanta+ese+geche
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3be3a7_060adc6a93b74613bb453f6a5b6a104c.pdf
    • https://static.usrfiles.com/ugd/963627_22a0c50fa8934cbcbf249f3a36351a93.pdf
    • https://static.usrfiles.com/ugd/599f1c_bd27c24eb612401f87883ff03165507c.pdf
    • https://static.usrfiles.com/ugd/dd4472_a5c150f139814893884f69464ff1c4dc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/41163850351.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/29475273969.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/spiderman_full_hd_wallpaper_for_android.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_eaf929e161704830a620b85b5a4a0a78.pdf
    • https://static.usrfiles.com/ugd/1849a1_4bc0619afa164063b066a9949ff98c0d.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3166/files/zojefebunulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76423385748.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/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007577.bin
30e2c3fee731b661e2da6b2f2e1b74dbb42a46ad5e59f97f2dfb4ea707a5942a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7577 5176 bytes
font_01_sfnt_off00008711.bin
5d53a2f9e1fe32a75ac0aea9c71c5e667ee171f251c808b85447936d808b0a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8711 6772 bytes
font_02_sfnt_off00009d50.bin
6f111f62c874d9533e9482041100b0434e798e1b5863a22d7e2a047c7f1caa06
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D50 10712 bytes