Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8833027ef8c40b…

MALICIOUS

PDF

43.1 KB Created: 2020-08-28 02:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4059ed0f213b2b527bf23f286212394 SHA-1: 333c3701392c201ebac6cbdd63136bc7ffb9b9eb SHA-256: 4b8833027ef8c40b84d14395a528ac08bc69631e141f80f918d122edb78f8fb7
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The document body, though partially obfuscated, contains the title 'Ejemplos de oraciones coordinadas y subordinadas' and the malicious redirector URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious.

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.link/pify?keyword=ejemplos+de+oraciones+coordinadas+y+subordinadas
    • http://files.goodwin-niering.com/uploads/1/3/1/4/131409526/nuvoxupivabulul.pdf
    • http://files.suzielhafez.org/uploads/1/3/0/8/130873717/puzoduzinowumapo.pdf
    • http://files.tradebohon.com/uploads/1/3/2/6/132681579/7209022.pdf
    • http://bevom.si-trivalley.org/uploads/1/3/2/6/132683289/2f357d5c99.pdf
    • http://jofebidu.frenchafricanmissions.com/uploads/1/3/0/7/130740497/veruxeko-veminovexubixaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tapowizilefaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2066/files/sigonom.pdf
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/24120581482.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3702/files/aparate_77777_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/2783/1712/files/vifiwivivokavekexi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/74050537502.pdf
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/73103069511.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/sipigokiduf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/weekly_meal_planner_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/24644067193.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4978/files/adhd_treatment_plan.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/nizilakekituxararopowu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/busted_television_gungeon.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_off00006750.bin
73603b7226558a88136ab3b933c46e141fcf41e507230208b85f0b30638abd0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6750 5492 bytes
font_01_sfnt_off000079f0.bin
db55c3e2f481e1dcf533f76dd384b500a46f9a80ee62f6dda4f2a305c0e219b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F0 10888 bytes

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