Malicious PDF — malware analysis report

Static analysis result for SHA-256 0120a09ce637fcb8…

MALICIOUS

PDF

48.3 KB Created: 2020-07-31 07:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8bcf6f8ecd4c02a14299a83c0c43edb SHA-1: e2381ea5d3b33a90daf720b6da6dd581064012f1 SHA-256: 0120a09ce637fcb891c8d213077374b6f8d5de080cea47a54d84388613aaac85
154 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and heuristics indicate it contains a large number of external links, including one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links suggests a link farm or redirection attack. The primary malicious URL identified is ttraff.ru.

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=multivariate+statistics+textbook+pdf
    • http://files.strawberryblondebakery.com/uploads/1/3/0/9/130969723/8de9ecbd9.pdf
    • http://files.emilynolanviolin.com/uploads/1/3/1/4/131437632/6665452.pdf
    • http://files.thecastlespa.co.uk/uploads/1/3/2/6/132696210/dokidi_vesagufikux_lenadu.pdf
    • http://files.devangaloka.com/uploads/1/3/1/6/131606118/5218812.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/34366825658.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/54023076956.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/wafijet.pdf
    • https://cdn.shopify.com/s/files/1/0435/4179/0871/files/dovarexazobadisevetatigej.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/68969261917.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/balimapo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0011/7928/files/47801739553.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/pivijopabegebivavejiki.pdf
    • https://cdn.shopify.com/s/files/1/0436/2669/2761/files/jozisekit.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/72251281984.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/62145834559.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/62873659142.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fdc.bin
702027d084a33344854c4bc5c948dd19617cab599ae5f8aeda53321d581cf8b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDC 5264 bytes
font_01_sfnt_off000091d7.bin
e78c3660d17454d2a375874b7b1435578a2ffdbafea2205225c07dfb0febe608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91D7 9996 bytes

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