Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bccb39ca8ea3ba8…

MALICIOUS

PDF

41.3 KB Created: 2020-09-02 00:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eb2d704938432aa4a85dcab2185c62a SHA-1: 0f6492ae6aacfe502d82db369acc9195ccdbbd88 SHA-256: 5bccb39ca8ea3ba8da8a2d652e02a941523022c44f5a90c2b7ccee32b51682c8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the 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.com/wix?keyword=adverbs+worksheet+5th+grade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/544e7e_5faf94a2c4cb460d859d30c4b7980434.pdf
    • https://static.usrfiles.com/ugd/05301a_62eea445f536493ab9e2f16111602204.pdf
    • https://static.usrfiles.com/ugd/36f25b_c03947f178fe48b991d245ec28c0538b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3daa7cc62bae48708f7609399e071a1b.pdf
    • https://cdn.shopify.com/s/files/1/0429/1887/1207/files/benadryl_injetavel_bula.pdf
    • https://cdn.shopify.com/s/files/1/0464/7128/2846/files/notifier_firewarden_50_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9597/3283/files/24256907973.pdf
    • https://static.usrfiles.com/ugd/4b7290_0ef66288304642ab93fbed14c84b67b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a96b52027037426995c4055e1696a306.pdf
    • https://static.usrfiles.com/ugd/628a76_4c542fa52563446f8ef237f3deba3313.pdf
    • https://static.usrfiles.com/ugd/cb2bed_37170671285f4f03bd607279209a7f86.pdf
    • https://cdn.shopify.com/s/files/1/0431/5591/4918/files/windows_7_black_edition_32_bit_iso_k.pdf
    • https://cdn.shopify.com/s/files/1/0436/0051/1138/files/57202173618.pdf
    • https://cdn.shopify.com/s/files/1/0434/8854/2872/files/20866943008.pdf
    • https://cdn.shopify.com/s/files/1/0460/3694/3007/files/destiny_2_dreaming_city_bounty_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/80159290725.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_off000062d4.bin
8df70a3932eaa275582db47c0a846f6d8f962a0e05837f492c4216ea54399028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D4 5524 bytes
font_01_sfnt_off000075ad.bin
d2e858aa5146b811cd846f0137c89992b98088d1be96ae62d15b210146c23c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AD 10072 bytes

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