Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f21f208e666e1cf…

MALICIOUS

PDF

44.2 KB Created: 2020-08-25 09:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2166bfac4a56a24efe8448cc4ca374b5 SHA-1: b56537d3641cd66c65a5b4c4e0970287feee7e69 SHA-256: 1f21f208e666e1cfefe24f447b99ceb41dc1fa6094e2f5cc8d5d96d9aaa2d92e
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=present+tense+spanish+verbs+worksheets'. The document body also contains this URL along with numerous other links hosted on Shopify, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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/pify?keyword=present+tense+spanish+verbs+worksheets
    • http://files.siracusavillas.com/uploads/1/3/1/3/131380397/lofufi-xojot-levovodisazote-nabovuve.pdf
    • http://files.gammazetadecaturtn.com/uploads/1/3/1/4/131452750/4148767.pdf
    • http://files.mscortes.com/uploads/1/3/0/8/130874110/dcd89.pdf
    • http://sefuro.passafling.com/uploads/1/3/1/0/131070356/berizovo_lemijatikota_zazuwidusorexud.pdf
    • http://satagug.ashleyscleaningservice.org/uploads/1/3/1/3/131379394/35ae3384.pdf
    • https://cdn.shopify.com/s/files/1/0437/5861/6733/files/sukodolovituri.pdf
    • https://cdn.shopify.com/s/files/1/0451/0665/9493/files/ball_bearing_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/2139480392.pdf
    • https://cdn.shopify.com/s/files/1/0430/2854/5693/files/how_to_analyze_large_data_sets_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/4740/3168/files/sijabijiju.pdf
    • https://cdn.shopify.com/s/files/1/0433/6661/3141/files/navav.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/fijof.pdf
    • https://cdn.shopify.com/s/files/1/0428/1466/8959/files/tezafaderesalesizuzedak.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/24443474714.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/conformations_of_cyclohexane_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9109/files/90758544429.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/zigabufutasak.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_off00006e23.bin
f914d769794f72dc429f157a800dd629afd53c903e0f8445c3448e9175960946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E23 5232 bytes
font_01_sfnt_off00007fee.bin
02772174776b373f063d44eca13d6326890e67a797562e9fbdf847d6de4abffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEE 10412 bytes

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