Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1587e9d4b894c0…

MALICIOUS

PDF

49.1 KB Created: 2020-09-01 10:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a1d516d596010166c69ec705f0909c7 SHA-1: ab0299016f4111d43ce93f50a90daaba8c38f133 SHA-256: 6b1587e9d4b894c0b1b25fd3acbe5278a9c925fe765b30e344dfaf5bd6bee49a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to benign Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious. The embedded URL 'https://ttraff.com/wix?keyword=appsheet+l%25C3%25A0+g%25C3%25AC' is the primary indicator of malicious intent, likely serving as a lure for further malicious activity.

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=appsheet+l%25C3%25A0+g%25C3%25AC
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6025/7177/files/atresia_intestinal_en_neonatos.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/31804826762.pdf
    • https://cdn.shopify.com/s/files/1/0431/9376/1941/files/bizofilajite.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/71557041470.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1326/files/xijaziwafezakujunedukewa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/62652511208.pdf
    • https://cdn.shopify.com/s/files/1/0462/6540/1495/files/42440358548.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/zajajexajiduvogafafejurer.pdf
    • https://cdn.shopify.com/s/files/1/0436/0463/9907/files/modular_power_supply_cables_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/1349/7247/files/jutuwanezej.pdf
    • https://cdn.shopify.com/s/files/1/0432/5507/0880/files/85756360098.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/39716761254.pdf
    • https://cdn.shopify.com/s/files/1/0433/9679/2471/files/canon_in_d_piano_music.pdf
    • https://static.usrfiles.com/ugd/fd3290_44d03207adfc444b81292a1b5927dc9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_16bf48bd082c452bb919ec2e4d5c69ff.pdf
    • https://static.usrfiles.com/ugd/3b47cb_1d4adabdb95544c7bc09fb863537e4de.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_off00007760.bin
56ed8f96736b04e00f41471c0bd8dd0d75595eb57db70bac86b004166dcf478f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7760 5052 bytes
font_01_sfnt_off00008890.bin
c70cc08070c724c6483439084eb96fc1bbb984e5d73c1174d1c84c5f55ffc340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8890 14844 bytes

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