Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51d85d952a59a64…

MALICIOUS

PDF

52.2 KB Created: 2020-08-13 05:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b53e7c559658bf882915a868b4aa19 SHA-1: 5655dffeda044787213f8f93030b74157098c25c SHA-256: c51d85d952a59a64ec6ab44124a24cea86991ea6f56e6491d5dca5fdea446e5a
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector at 'ttraff.ru'. The document body, though partially corrupted, contains text related to 'Wordly wise book 7 lesson 4 test pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness.

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.ru/pify?keyword=wordly+wise+book+7+lesson+4+test+pdf
    • http://files.oleanderpress.com/uploads/1/3/1/6/131636642/mugonebod-guwijebufi.pdf
    • http://tivamipi.hodgmanliterary.com/uploads/1/3/1/3/131383483/1d7567b35.pdf
    • http://files.runnersrelief.com/uploads/1/3/2/3/132303035/bffac.pdf
    • https://cdn.shopify.com/s/files/1/0436/6372/0613/files/renew_drivers_license_online_texas.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/pupexukuvezetidumul.pdf
    • https://cdn.shopify.com/s/files/1/0434/4951/6199/files/loan_amortization_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0440/6309/6984/files/gisimerasalunesow.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6040/files/griffiths_quantum_mechanics_solutions_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/keredowowut.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/warizotu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/96482894392.pdf
    • https://cdn.shopify.com/s/files/1/0440/7102/6853/files/succeed_in_cambridge_english_movers_8.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/65819254441.pdf
    • https://cdn.shopify.com/s/files/1/0436/7699/1653/files/pathfinder_ultimate_intrigue_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/20450021704.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a47.bin
baa808f677b4bcb2be93bcb843d6e5b0171a0fd955b1b1ef81d654670d925f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A47 5192 bytes
font_01_sfnt_off00007c1a.bin
49f1c345582212729590e0456707ca92d3838aef8cba26fbcaa28f8c5b0a0640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1A 2116 bytes
font_02_sfnt_off000085e5.bin
34bf11be0d8821c96b73221601ee8efd785b998a2972b4c0f6cb39870b53d30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E5 15328 bytes
font_03_sfnt_off0000b510.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 4324 bytes

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