Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffebef5f22a359e2…

MALICIOUS

PDF

43.2 KB Created: 2020-08-09 01:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a1972b731784d4ea8f41e4193588689 SHA-1: 3a3e222ab1c0278663d1c05e2cbe0b2e141629f1 SHA-256: ffebef5f22a359e2c25cbf99aa38330752e475ea969ce7fc4244cc2d0b6a90c6
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as UPSC interview preparation material. This suggests a phishing or social engineering attack aimed at redirecting users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=upsc+interview+preparation+pdf
    • http://files.ccmiddleeast.org/uploads/1/3/1/4/131453674/jepisufital_rewilif_jaxedogovefikaj.pdf
    • http://berub.hermosawebdesign.com/uploads/1/3/2/7/132740541/jinubidukejodu.pdf
    • http://files.shearserenitysalon.net/uploads/1/3/1/3/131379759/8772874.pdf
    • http://files.seanaffordfineartstudio.co.uk/uploads/1/3/1/4/131438461/9233b5592b64.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/school_bus_license_3.pdf
    • https://cdn.shopify.com/s/files/1/0435/4277/3914/files/sukoli.pdf
    • https://cdn.shopify.com/s/files/1/0432/2561/2450/files/68403908919.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/allan_pease_beden_dili.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7762/files/woruwumujeza.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/93382197490.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/rneklerle_sap2020_v15_birsen_yaynevi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7831/files/pumamapajakirixorevob.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/11th_class_biology_book_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/bumevofimovolone.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/tsc_annual_leave_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/1539/5738/files/farmall_m_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/jiruruzufibuzejaru.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/phonology_definition_linguistics.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_off00006ad7.bin
af1ae7caec72044db8de64d4db7af8267a825f1a75e305e620040890fa4aa1f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD7 5260 bytes
font_01_sfnt_off00007ce5.bin
d5558ee2f5032c1f9a88ad0ebb7e7c89237a5e33482258999b885521f0ca3ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE5 10192 bytes

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