Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b4c1f16be92b5a…

MALICIOUS

PDF

46.6 KB Created: 2020-09-01 11:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1304ca4b23ca9e28291c564263f3ea53 SHA-1: 0a631bc3c498819cfa3b401e2de23e6e3d25a9ac SHA-256: 68b4c1f16be92b5a0b3baaa9abd2cbca9fba17256de4ac5cc6c0c508bbe239d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by heuristics, suggesting an attempt to direct users to malicious content.

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=teri+aankhen+picture
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/android_8._1._0_root_no_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/bohemia_rapper_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/kuvunelulupiwuwa.pdf
    • https://static.usrfiles.com/ugd/cc10e7_01a43ba4ceb344ffbc1589e2ad326ea3.pdf
    • https://static.usrfiles.com/ugd/d1d005_236193cff1434d64906cc6a0db203ea5.pdf
    • https://static.usrfiles.com/ugd/b916f4_9975055989b047a1925b1dd744faf6d2.pdf
    • https://cdn.shopify.com/s/files/1/0437/7467/3057/files/74163103830.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/pemenedipemanogurixobepow.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1402/files/17478671542.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/viwavuwopijixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/dell_poweredge_fx2.pdf
    • https://cdn.shopify.com/s/files/1/0466/2309/6997/files/thank_you_letter_for_leaving_job_tem.pdf
    • https://cdn.shopify.com/s/files/1/0462/7352/7959/files/algebra_2_factoring_review_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/38641305168.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87195604050.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/10711925173.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_off00006e86.bin
97123cf114727e0803de8ec5b2de82a8ea1159e9344f65d6283ec9045c9a4ac3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E86 4824 bytes
font_01_sfnt_off00007ee9.bin
4340be615b38429064f9ed5975f4b59f18fc67a57995a07bb53a43ad66c651e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE9 15084 bytes