Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc845a8f3086ff4…

MALICIOUS

PDF

40.0 KB Created: 2020-08-12 23:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e7d51f08c5772f76fb932c7cd95bb1 SHA-1: d54c80b55a21840bff581f42c31262d08a408489 SHA-256: ecc845a8f3086ff47225d7a9a6a8204296a26ac585719a6c83d614edcc94e6d0
152 Risk Score

Malware Insights

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

This PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.cc/wb?keyword=number%20line%20multiplication%20worksheet%20pdf. The document's content, though heavily obfuscated, appears to be a lure, presenting itself as a multiplication worksheet to entice users to click the malicious link. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many hosted on Shopify, further supports the SEO-based link farm tactic.

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/wb?keyword=number%20line%20multiplication%20worksheet%20pdf
    • http://files.sdbvl.com/uploads/1/3/1/4/131454816/bezabuxozizuluk_guzurila_jowaluvimiji_finixinemuvaxij.pdf
    • http://files.iamphotos.net/uploads/1/3/1/8/131857540/geribomuvafunoro.pdf
    • http://files.messylifechurch.org/uploads/1/3/1/1/131164440/6904077.pdf
    • http://files.teaflowergardens.com/uploads/1/3/2/6/132681767/rofos_wefakifokizebog_zapubomub.pdf
    • https://cdn.shopify.com/s/files/1/0437/2499/6758/files/10423078499.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/60299181036.pdf
    • https://cdn.shopify.com/s/files/1/0438/0514/7298/files/56493629459.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/44501522216.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1046/files/95919890528.pdf
    • https://cdn.shopify.com/s/files/1/0433/9931/5619/files/69431895258.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1447/files/79800134393.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/17073906289.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/vegagewowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/radasibemi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/61695922778.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5061/files/verbal_ability_questions_for_cat.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/introduction_to_bayesian_statistics_book.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_off00005e61.bin
6213d77c2db8214c418dd842993dff4fee95c0d2e806df7258f9572108c2eda9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 5660 bytes
font_01_sfnt_off0000717e.bin
0335048eda45362f94ec422b5e095d243b6b8cc5bd0a1fb72130a97f58748581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717E 9772 bytes

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