Malicious PDF — malware analysis report

Static analysis result for SHA-256 de85aaed6746900d…

MALICIOUS

PDF

44.3 KB Created: 2020-08-10 05:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c95fbeb66655be6d5e4a277be46f317f SHA-1: f17600e1ef6626036cdb5098405963e5f4e8ac82 SHA-256: de85aaed6746900d5e402e4eac98c88e1c62cd8dad315262e536b14039331cd7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body itself is heavily obfuscated but contains references to the redirector URL and other Shopify-hosted PDFs, suggesting a link farm or SEO poisoning attack. The primary intent appears to be redirecting users to malicious sites through a deceptive document.

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=penguin+anthology+of+twentieth+century+american+poetry+pdf
    • http://vevozina.sethdaley.com/uploads/1/3/2/6/132683014/nosutiw.pdf
    • http://files.armleydancestudios.com/uploads/1/3/2/3/132302924/d0eaac3cdd2.pdf
    • http://sobet.nurturingsprouts.com/uploads/1/3/1/3/131380600/litagosulugagapawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/runigaresuteludaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/1997/files/7351549364.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/jufazex.pdf
    • https://cdn.shopify.com/s/files/1/0434/4135/6967/files/antrenmanlarla_matematik_2_yandex.pdf
    • https://cdn.shopify.com/s/files/1/0439/8225/8334/files/35104633977.pdf
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/losorixesugelorodilagik.pdf
    • https://cdn.shopify.com/s/files/1/0438/1288/0541/files/bangla_calendar_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/15253027912.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/epic_simile_definition.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1613/files/pikufojitanijexu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1050/5379/files/alter_ego_a1_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1298/8821/files/a_cabanagem_no_amapa.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/92310489111.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/spinoza_ethics_part_1.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_off00006d5f.bin
a1d70b09371af3fa3fc500af1acceb5187f629df0b7be42c8a6a4560bc9d2dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5F 5588 bytes
font_01_sfnt_off00008053.bin
6c8d40ecd6434a15a533a30349f3b5facb21b6a0cffeef654d9f6b5678551d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8053 10500 bytes

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