Malicious PDF — malware analysis report

Static analysis result for SHA-256 70702acb8385788e…

MALICIOUS

PDF

116.4 KB Created: 2020-08-03 15:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ce0252f140dc7a327d7fa2184281623 SHA-1: 58602217559f5f6e548892e9326cf39f6ccdb139 SHA-256: 70702acb8385788e908f5cda1f7d6d051620b88561516d079dac1f8ebee0a7e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a link farm designed to appear as legitimate PDF documents. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=concepto+de+amparo+directo+pdf'. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a phishing or malware distribution campaign.

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=concepto+de+amparo+directo+pdf
    • http://files.bambus-produkte.info/uploads/1/3/2/8/132814930/lijonuzojasufo.pdf
    • http://files.mcyouthfootball.com/uploads/1/3/1/4/131482946/bikajemawakeku.pdf
    • http://files.cornerstoneferndale.org/uploads/1/3/0/7/130740591/bapeda_sunezaj_mabapi_kojesurar.pdf
    • http://files.gogovernors.com/uploads/1/3/1/4/131406762/6528224.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/8112/2471/files/chicco_car_seat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/17352327458.pdf
    • https://cdn.shopify.com/s/files/1/0434/8932/9312/files/87098922001.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/44740093143.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/cell_a_molecular_approach_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/gojodokiborodikese.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/maliweregino.pdf
    • https://cdn.shopify.com/s/files/1/0433/7627/9702/files/79717800303.pdf
    • https://cdn.shopify.com/s/files/1/0428/9822/7353/files/41792620143.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/20354151046.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/8348545377.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c28.bin
391bdc0be36c0d1bf02e681375182d80cd4fd409fb7603a5f5bc07b0bf4de816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C28 4900 bytes
font_01_sfnt_off00018cb4.bin
19d2df9d304422f7437dca1095414be9c61d8dfb35fb7a04f3c52e6cc957c4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB4 12180 bytes
font_02_sfnt_off0001b432.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B432 4324 bytes

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