Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b46ef5eb251876…

MALICIOUS

PDF

44.6 KB Created: 2020-08-16 22:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9595f4f6395e2472a7330f4e2e415b1 SHA-1: cd22a25d420257b07f8cff8bf89f92c29ffe328d SHA-256: b9b46ef5eb251876cffeae08ba7ed3621807a92a6f42dbad6e716d8e7a65a8b8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. The document body, though partially obfuscated, contains text related to business letters and the malicious URL itself, suggesting a phishing or malware delivery attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the redirection to a malicious site.

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/pify?keyword=business+letter+format+cc+line
    • http://files.kilmarnockexpresidents.com/uploads/1/3/1/4/131452804/1182176.pdf
    • http://xixatumu.thedragonshoard.net/uploads/1/3/1/4/131482975/9770802.pdf
    • http://vilel.winchad.com/uploads/1/3/1/6/131606758/nurajamig_majir_repoduxosofimi_tewuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/actualisation_de_soi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7775/files/learn_french_with_alexa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/computer_abbreviations_list_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8733/files/narewusenatevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/76120909717.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/k-_lite_codec.pdf
    • https://cdn.shopify.com/s/files/1/0433/7011/9333/files/atns_bursary_application_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/runurogukanetib.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/vufizutaruwirujeje.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/16434151998.pdf
    • https://cdn.shopify.com/s/files/1/0432/4219/3058/files/578036224.pdf
    • https://cdn.shopify.com/s/files/1/0438/3988/1373/files/53152113455.pdf
    • https://cdn.shopify.com/s/files/1/0428/1729/0407/files/seinfeld_season_9.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_off000070ed.bin
328311d3458d71da211607fb3d5e0d7714c5da077b7562e6fffbd6ffb9ccb9fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70ED 5076 bytes
font_01_sfnt_off0000820f.bin
c2f64fc376441734421cdbc91c24efde13e77510f1f489ff6ea6d88c4e2c960b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820F 10416 bytes

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