Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96606aa2a49c4e3…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 04:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a02c09407286ef7d6abb7e07e1673c SHA-1: 477dd7f9bba5bc8f134e2a7d185e3638535d7867 SHA-256: b96606aa2a49c4e3dd0aba62a07e968ac502afcaacc2d146e1ba49463e73af90
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, which is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains the URL that likely serves as the lure. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous Shopify-hosted PDF links suggests a link farm or SEO poisoning attempt to distribute the 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=problemas+fundamentales+de+la+etica
    • https://cdn.shopify.com/s/files/1/0435/4467/4455/files/67179396595.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/jamobedozaxavizolid.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/xivemafojesixek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44368867506.pdf
    • https://cdn.shopify.com/s/files/1/0434/4234/0007/files/armored_core_3_op_intensify_guide.pdf
    • https://static.usrfiles.com/ugd/08fe48_b6c2e38c9e9f43eca470ccfeab879895.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/chori_chori_movie_songs_3gp_video.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/case_1845c_specs.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/fivolizaziwikavazepeto.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/94287487073.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/ftse_all_share_index.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/5164979740.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/1997/files/hepatic_encephalopathy_review_article.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/46934337327.pdf
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/skyrim_deadly_mutilation.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006321.bin
e2181b3ee4c00d9b036dc610cf62a3291f876665c9a17519143b8dc9f92fe67d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6321 5308 bytes
font_01_sfnt_off00007509.bin
aadc277e89abdc8763242511b185f39750cfe592c34c17a491fcf84db6f841eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7509 10968 bytes