Malicious PDF — malware analysis report

Static analysis result for SHA-256 a599c90d7a5d4261…

MALICIOUS

PDF

48.5 KB Created: 2020-09-07 21:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eb3fa6ecc376b31f5a8b9251babdff2a SHA-1: 7efa406437535fb989b8a4c3c3aeaf68d76ddef9 SHA-256: a599c90d7a5d426111873403c9b659dc3be7bcf59e0a56d9d4dbea12daeba640
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicated maliciousness. The embedded URL and the document body suggest a lure related to a 'flat stomach workout app' to entice users to click the malicious link.

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.club/pify?keyword=flat+stomach+workout+app In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/ad2ade_c9084d12fda34f238631e9f0959a762d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/808d8c_2654a2004cb946fda3a2e024e9e25b3c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2c76f4_e97ca1b9000747a782bb265bf1cb6f48.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/575fb0_a8b972bbd6884712b2cc2a660883d067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/57717368555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/sisademawubitiwiwilawi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9165/6855/files/14575311928.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5666/0633/files/82797249878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/valuberurosaduvovoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/tererezodavabenof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/rimenotevekup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/luwojo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA6 5284 bytes
SHA-256: 380b57d0c2d1e0ee5f4c81795cb6aa5422dd3daae00d080f4d435f0d9e47fd7a
font_01_sfnt_off00009186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9186 10452 bytes
SHA-256: 222ee93be883aaad0e5ea3d4f495dcfca7fa8ef8f3b50c04d9de8d5800caa244

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