Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f08b929826715e…

MALICIOUS

PDF

36.2 KB Created: 2020-08-31 02:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f23581c23ab0f0270939f3052753808 SHA-1: 0485fa566fc2ab014591f4aa61c3ea98edfdf070 SHA-256: 78f08b929826715e88e497e43a7284db4eeae2a61c898f99341d947f8f2340cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This link is presented within the document body, suggesting a phishing or social engineering attempt to lure users. The PDF also contains a link farm of numerous PDFs hosted on Shopify, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=show+my+homework+mackie
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8558/5820/files/42058998858.pdf
    • https://cdn.shopify.com/s/files/1/0437/4000/4501/files/fezitokujakubezodarejudig.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/77330250673.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/disney_employee_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/9902/0696/files/ap_edition_calculus_10e.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/14295814255.pdf
    • https://cdn.shopify.com/s/files/1/0439/4608/2472/files/fire_emblem_warriors_stats.pdf
    • https://cdn.shopify.com/s/files/1/0434/0590/1991/files/minna_no_nihongo_answer_key_chapter_13.pdf
    • https://cdn.shopify.com/s/files/1/0433/5095/0041/files/61382179451.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b4af1d3e5da46b993c3cdf2095c5294.pdf
    • https://static.usrfiles.com/ugd/89064d_1d6a86bb4e8a4a5db5d460575e2711cf.pdf
    • https://static.usrfiles.com/ugd/b88e3d_99afb3f2b7654229b9d3ad1eaef5ef70.pdf
    • https://static.usrfiles.com/ugd/c8a981_bd72aae0e40546729d2188c1d75040ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee60ffe794b9420398a5a1d2f0fbddd4.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_off00004dca.bin
c3f68fc72f736097604b2844e717b6591b34b07f493a80ba2525d54314bd933c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DCA 5192 bytes
font_01_sfnt_off00005f5d.bin
d48234750feff208a4153b197ee22fd5393111dd23094e9d9f7a33f7da9ca652
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5D 11360 bytes