Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ba5c2fbc1330f3…

MALICIOUS

PDF

38.7 KB Created: 2020-09-29 20:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec5742b0a3d7656af2c21f997c1f1386 SHA-1: d0eb2456cd03cf80cbb29a373547b5335c3c9aba SHA-256: e9ba5c2fbc1330f336db0a033bc7c54cc2413814e30fb67e91230df23c56bf79
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, suggesting the document's primary purpose is to lead users to malicious infrastructure. The document body text, though heavily obfuscated, contains keywords related to downloading PDFs, reinforcing the lure. No scripts were extracted from this sample.

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://ggtraff.ru/strik?keyword=maus+graphic+novel+pdf+free+download
    • http://files.alison-harper.com/uploads/1/3/2/8/132815866/4262913.pdf
    • http://fanov.stannersenglish.com/uploads/1/3/0/9/130969895/44c2d8.pdf
    • http://naxamu.maijaranka.com/uploads/1/3/1/6/131606490/3131863.pdf
    • http://files.prosperousgaa.com/uploads/1/3/2/7/132712323/dovewegapome.pdf
    • http://files.olayouth-atlanta.org/uploads/1/3/1/6/131637308/veramono_fujadarow_jaratiwumaxorib.pdf
    • https://site-1036951.mozfiles.com/files/1036951/xufedojizawobo.pdf
    • https://site-1036635.mozfiles.com/files/1036635/77445308936.pdf
    • https://site-1036811.mozfiles.com/files/1036811/zumatik.pdf
    • https://uploads.strikinglycdn.com/files/4e42251b-ab3d-4219-aced-90bc47ddd1aa/dabigedizu.pdf
    • https://uploads.strikinglycdn.com/files/acd84499-6589-4b63-a301-1a4f8517b9de/lizafexabarev.pdf
    • https://uploads.strikinglycdn.com/files/35183ca8-b777-4798-8620-b94fdb77af15/wakanuv.pdf
    • https://cdn.shopify.com/s/files/1/0463/6665/4619/files/bhole_baba_new_rap_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/99169217565.pdf
    • https://cdn.shopify.com/s/files/1/0477/5536/2460/files/descargar_peliculas_gratis_en_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0437/1641/1547/files/55822843239.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/45327500818.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_off000056d1.bin
b6337403e3bdaedcc37ea35f94e209bdc7d8b2a503d17fd8e1fd576870f668d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x56D1 5576 bytes
font_01_sfnt_off000069e9.bin
e2ddc83e7a8c81411a6dec5eccb01fd256d913814d1276f93dfe7f02fbbf282a
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E9 10496 bytes