Malicious PDF — malware analysis report

Static analysis result for SHA-256 940342bb8df747ca…

MALICIOUS

PDF

49.3 KB Created: 2020-08-22 00:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d062668ba6e6c9adbd3c9a71a10294a1 SHA-1: 34181b7e91f3d4dc8f5dafc6ed7c1b9300c2f11d SHA-256: 940342bb8df747ca1eeabea8090ba0fa5fccec6806e63fc5deb2fff3746f0a81
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF document contains a high number of embedded links, many pointing to external resources, which is indicative of a link farm or redirection scheme. The primary malicious URL, 'https://ttraff.cc/pify?keyword=principios+de+asepsia+y+antisepsia+oms+pdf', is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to 'Principios de asepsia y antisepsia oms pdf', suggesting a lure to disguise the malicious links as legitimate academic content.

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=principios+de+asepsia+y+antisepsia+oms+pdf
    • http://files.ashliebailey.info/uploads/1/3/0/8/130874162/2a14e.pdf
    • http://files.darcrainbow.com/uploads/1/3/1/8/131857626/232402a4667b.pdf
    • http://files.victoriasdesign.studio/uploads/1/3/0/7/130738918/3901602.pdf
    • http://fubivare.skateteamindy.com/uploads/1/3/2/3/132303093/f6d1d9cb9afd4be.pdf
    • http://rivafeda.booknomadpodcast.com/uploads/1/3/1/0/131070374/3b2750.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/6651738327.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/98832236652.pdf
    • https://cdn.shopify.com/s/files/1/0431/1210/4103/files/83403871455.pdf
    • https://cdn.shopify.com/s/files/1/0428/7964/7903/files/terminal_code_for_mac_webcam.pdf
    • https://cdn.shopify.com/s/files/1/0460/1656/1319/files/tatonasokibopa.pdf
    • https://cdn.shopify.com/s/files/1/0438/5269/3654/files/pdf_akuntansi_keuangan_kelas_11_semester_1.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3085/files/mereroxolejelatupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1734/files/mitsubishi_mini_split_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7397/8011/files/82706111650.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1791/files/xuwejevimomo.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_off00007166.bin
f4b44bc52e498d43e8d9d88fe8a30335cdec1fb45d1352ad33feb84445bc0a79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7166 5160 bytes
font_01_sfnt_off000082cf.bin
89707b79a41fa9d2123c039d8dc8b1e3a30d29f48e5a3f7bf0f9dda15070dae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CF 11556 bytes
font_02_sfnt_off0000a831.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA831 4324 bytes

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