Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec851416e150403…

MALICIOUS

PDF

50.8 KB Created: 2020-08-04 18:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9d096cc6a0a121bf65e225585118bdf SHA-1: 12541b68f1c088e8fc1a72434a2feca3be5ce5a7 SHA-256: 2ec851416e150403a1f66ecfac7d9843ffba96d28e5f497109a4bfc5a04d5522
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.cc/pify?keyword=rigor+mortis+stages+pdf', which is likely used to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links to external PDFs suggests a link farm or redirection strategy to distribute malicious payloads or phishing lures.

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.cc/pify?keyword=rigor+mortis+stages+pdf
    • http://jebedid.ecp-wi.org/uploads/1/3/0/7/130738837/4b24268abd.pdf
    • http://files.camarillocommunitygardens.org/uploads/1/3/0/8/130813846/xixiwige.pdf
    • http://files.lifestylemedicine.pro/uploads/1/3/0/7/130739906/bifabuwuzowikud.pdf
    • http://files.logosart.com.hk/uploads/1/3/1/6/131606533/bonokidufezobijariji.pdf
    • http://rifitiw.soulfoodcrystals.com/uploads/1/3/0/8/130874254/1994983.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/no_mosaic_sims_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/20888478859.pdf
    • https://cdn.shopify.com/s/files/1/0435/1010/4228/files/wojedima.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/jilebilavikadoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6913/7305/files/el_porto_surf_cam.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2412/files/20483305093.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/23533903343.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43377474007.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/fokiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/defecto_septal_atrial.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/iso_3166_1_alpha_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/8687/9647/files/70599989945.pdf
    • https://cdn.shopify.com/s/files/1/0438/8962/3208/files/47264371985.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cfc.bin
37a885dc2f9ece8d3a17f5a42bdb37a2e5011468ab196e4bad82c2c7eb69a339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFC 5016 bytes
font_01_sfnt_off00008e14.bin
9f81482546ae19bb264ab7fa8801af9184d2cb810811da7e729f65e88e751164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E14 9820 bytes
font_02_sfnt_off0000afa3.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA3 4324 bytes

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