Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3042ea434c86db…

MALICIOUS

PDF

40.9 KB Created: 2020-08-03 17:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13637ad1e07e000cd4741997f171e7f4 SHA-1: 76da93d9850bccd4bfc9233708e8c1d4c4455d5e SHA-256: 9f3042ea434c86dbbee6438c96480de1e736f7ec4f92a52ae4bd91efdb2a021a
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=apollonia+saintclair+pdf', which is also listed as a malicious redirector. The presence of a large number of embedded links, many pointing to external PDFs, suggests a link farm or content distribution strategy. 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=apollonia+saintclair+pdf
    • http://files.edhgs.com/uploads/1/3/1/4/131408529/lujaremokike_nezuki_derunelizaxeti_kelabij.pdf
    • http://files.jeanhamusic.com/uploads/1/3/0/8/130874050/minisafo-xasave-kinuvazopegatez.pdf
    • http://files.thesaltbarmacclesfield.com/uploads/1/3/1/3/131383754/vezusexegaze-kokivu-kuvulawo.pdf
    • http://files.maurermobileblasting.com/uploads/1/3/2/7/132741476/nubamewafejumumedo.pdf
    • http://tifevujo.henleynaturalburials.co.uk/uploads/1/3/0/7/130740025/petig.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/89107333855.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/text_to_speech._types._voiceselectionparams.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/fibuti.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9638/files/vosel.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/77151084876.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/87681718401.pdf
    • https://cdn.shopify.com/s/files/1/0432/1617/5263/files/24033363147.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/45964689520.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/71843898253.pdf
    • https://cdn.shopify.com/s/files/1/0432/7827/0628/files/how_to_concatenate_strings_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/wakarijukuvozip.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/
    • https://cdn.shopify.com/s/files/1/0432/5376/0162

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006159.bin
2e747926734c2df99b8bab9f1d9a531f1f1b48c1148dfde60163c11b061c8319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6159 5140 bytes
font_01_sfnt_off000072e4.bin
41407a09027db1cb35ebd214351b70afd59d29c956abab8913f159cc81182db8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E4 10456 bytes

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