Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c5d9ea13665937…

MALICIOUS

PDF

40.6 KB Created: 2020-08-06 03:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bed2ecc80ad6be8d79a2c9d424c847c9 SHA-1: 0503a5811e0c56ba075f098b03bbb9a6c9519106 SHA-256: 05c5d9ea13665937efb79d94e0bee5381aaa6591cf1330e3844f1fec37dbe237
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with the primary URL pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme, designed to direct users to malicious infrastructure.

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=accumulation+by+dispossession+harvey+pdf
    • http://files.meiageddes.com/uploads/1/3/0/7/130776407/xubopopimidafaxefeza.pdf
    • http://files.mssierzega.com/uploads/1/3/1/3/131381374/a3926a12c.pdf
    • http://files.tammrabroughton.com/uploads/1/3/1/8/131856456/banamidatu_fumorowapikuz_dibebotimazas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/kugikisuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/52979848068.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/29637105157.pdf
    • https://cdn.shopify.com/s/files/1/0438/9847/0555/files/attributes_of_god_lawson.pdf
    • https://cdn.shopify.com/s/files/1/0438/2100/7005/files/pdf_to_word_converter_apk_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0438/5921/4501/files/kerabegozepobinexufafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/nimejo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/abbreviation_of_journals.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4565/files/50885219366.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/ffxiv_throne_gem.pdf
    • https://cdn.shopify.com/s/files/1/0433/9931/5619/files/parupakimowukexok.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6716/files/tibil.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/rei_exchange_policy.pdf
    • https://cdn.shopify.com/s/files/1/0428/5317/1356/files/1010326005.pdf
    • https://cdn.shopify.com/s/files/1/0434/5973/9814/files/autumn_leaves_improvisation_piano.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_off00005f32.bin
fcc1b15a6a2207c8b06ad26b88f3aaf0da2b8a48efcf187d4bb6dd5f83124313		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F32 5684 bytes
font_01_sfnt_off0000725f.bin
ffc7c59f123b3441b02327943744c5eda29d1b774ec3c077de76d67bfffa8f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725F 10152 bytes

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