Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6efe599a910c781…

MALICIOUS

PDF

41.0 KB Created: 2020-08-13 06:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7667bc72f7ebd477466aeaa6e987117 SHA-1: 2b475c1b13840aaa29f51f0826830728abe4df03 SHA-256: b6efe599a910c781b7bd94c125dc8a7491bbaca21f1227d79e26d60b7ad18b92
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector disguised as a search result for an academic book. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure. The document body itself is heavily obfuscated but contains the target URL, suggesting the primary purpose is to drive traffic to the malicious site.

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/wb?keyword=rodak
    • http://files.upcyclemom.net/uploads/1/3/2/6/132695525/pusuworujes.pdf
    • http://files.virtualsaguaro.com/uploads/1/3/1/4/131437322/fagefakaxeg.pdf
    • http://mitodete.brucebarnespoet.com/uploads/1/3/1/3/131381489/4925929.pdf
    • http://files.nancytangles.com/uploads/1/3/0/7/130740480/lazenumigulub_wusemizigiduzi_bulafikozomat_webudob.pdf
    • https://cdn.shopify.com/s/files/1/0440/2518/4421/files/najojuxikewuwejexin.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/zivebozatuxajizuku.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/aliens_colonial_marines_technical_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4947/4453/files/25562124131.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/fegevoginubozo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/67851438374.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7266/files/71551160034.pdf
    • https://cdn.shopify.com/s/files/1/0430/9476/9821/files/online_translator_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/marriage_certificate_online_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6486/0575/files/55693578017.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/31830496732.pdf
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/karawabuwifosujowumikeb.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/37747660354.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_off00005f2f.bin
189a7e5ce2fa436e80e5cbb749bf16a2cde5ffc16e19ccc86c79f8e1b8087e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2F 5900 bytes
font_01_sfnt_off0000733f.bin
589eb0d1f53924c1025e01e8c576307524826292648dba802c373c8fab78a8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733F 10236 bytes

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