Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cdbc936d77e9a7…

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 14:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03a5fd95bf60416c0dac3cb18ff6c2e7 SHA-1: e88b824adec78e2c98e9c818c40c21f55e244af2 SHA-256: 83cdbc936d77e9a7a2a050a9d3c5c722f2bc296a3e05319c627f97c125e3822e
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a modded application. The presence of many external PDF links suggests a link farm or redirection strategy. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=delicious+emily%2527+s+home+sweet+mod+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c4ccc4_31fcd83b0fd742599b922746f52b226e.pdf
    • https://static.usrfiles.com/ugd/0aab01_86dadb07bde6448286e92c59ccdfc3e8.pdf
    • https://static.usrfiles.com/ugd/de3d83_3c90a683745648758a4c0384a5c0bf03.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_cb9b06cc9d0748cbb5afcf368a8e879f.pdf
    • https://static.usrfiles.com/ugd/b8c837_92a9a8818da742069e763b7a136ede4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e835c8c5d900456da26b5ef66bba75af.pdf
    • https://static.usrfiles.com/ugd/2813e2_f9ae14ffa24945ffb7dbcf38c4f22144.pdf
    • https://static.usrfiles.com/ugd/a467d2_3bf45b71b4f2408b8792a6c8d04b147f.pdf
    • https://static.usrfiles.com/ugd/e5412a_736e023c7d23429f91efa45d6fe599f7.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/wudafetaluzoweta.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2733/files/91847325670.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/ravivo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8403/7792/files/crash_by_jerry_spinelli.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/apple_buyers_guide_airpods.pdf
    • https://cdn.shopify.com/s/files/1/0432/2908/5859/files/celf_5_screener_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8541/files/faguwizawulaman.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006642.bin
85b4b6f520aadc666a6c3dd1c6277a1c325b05b7fcf3904d634a059f87cee7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6642 5508 bytes
font_01_sfnt_off000078ff.bin
a78e858dd1d2cab3528cea1c11e1625b3d48908265f3b1c09914dec21ca96acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FF 10608 bytes

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