Malicious PDF — malware analysis report

Static analysis result for SHA-256 7672b778fbc5c4ec…

MALICIOUS

PDF

45.5 KB Created: 2020-08-20 01:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b19194c3595ef89edf59407f0b264298 SHA-1: 09653c58c009444dd2270963a76e24dd02ab6d5c SHA-256: 7672b778fbc5c4ec5273113696e2f399fd92d42f77b5627220216f0d6d017a97
194 Risk Score

Malware Insights

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

The PDF contains a lure for 'hd wallpaper for iphone 6 plus' which links to a known malicious redirector. It also contains a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicated maliciousness, and the advance-fee scam lure heuristic further supports this. No scripts were extracted, but the embedded URL is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=hd+wallpaper++for+iphone+6+plus
    • http://files.myungleeart.com/uploads/1/3/1/6/131637701/69c566cc932.pdf
    • http://files.forensicarts.org/uploads/1/3/1/4/131437563/gupixe_konuveponufe_rubevutofudami.pdf
    • http://sotuzex.rachelsword.com/uploads/1/3/0/8/130874493/5d2ca1d3112.pdf
    • http://files.rebelgearofficial.com/uploads/1/3/0/7/130739532/depijavopitisiz_xoxodefitudem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/animal_by_neon_trees.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/zebupozi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7991/files/boutonniere_deformity_swan_neck.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4701/files/wisivizebiluwejudunog.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/newedesutojivemekarenotez.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/sorafaroro.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/sodexo_application.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/39120725410.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/63347686582.pdf
    • https://cdn.shopify.com/s/files/1/0434/2926/5564/files/adobe_photoshop_express_vs_lightroom_android.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/mewofupilurutirezozevalif.pdf
    • https://cdn.shopify.com/s/files/1/0432/7974/5192/files/netisimulovilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48695811849.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_off000064e0.bin
1f36b7dddfa399317f1b5ba8bff4847f8c42f0e0186731886891ae6577932242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E0 5140 bytes
font_01_sfnt_off00007656.bin
d2b2970ec1a5e0283b20f213ea1f3191ad4d1922b0125ad6d103dd2dce5b1701		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7656 10684 bytes
font_02_sfnt_off00009ad4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD4 4324 bytes

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