Malicious PDF — malware analysis report

Static analysis result for SHA-256 7982967d26779d53…

MALICIOUS

PDF

42.7 KB Created: 2020-10-18 05:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aac2b9401409f92f49f78701dadb236b SHA-1: a732b5a5f5ece7ec75d5fab82ebc5a2c2b3c8d94 SHA-256: 7982967d26779d5376b9ce5f25ada320fac94a813b49bd619e25352a60a6386a
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically identified as a malicious redirector. The document body also contains a call-to-action phrase and a URL that appears to be a lure for a game download. The presence of a malicious redirector and a link farm suggests an attempt to drive traffic to malicious sites, likely for malware distribution or phishing.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/123?keyword=stickman+run+games+apk
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f8744576a6fc.pdf
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f87fd5166244.pdf
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f8a9aa1e673d.pdf
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f8a4e35d8777.pdf
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/b48d71.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lulodegoner.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/jogowezokuvaxu.pdf
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/7ec7f1472609892.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/467b8545-0f99-4539-8dea-317cf52fccad/79333282048.pdf
    • https://uploads.strikinglycdn.com/files/ac28d4ec-71dc-4add-ae19-7d3fe8f96311/kadoviw.pdf
    • https://uploads.strikinglycdn.com/files/63fd379d-afae-408d-99a2-d950c9f63759/pexijusizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/logical_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0484/2953/1293/files/romegodukati.pdf
    • https://cdn.shopify.com/s/files/1/0463/3935/8882/files/kindergarten_subtraction_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0467/5734/7491/files/fault_lines_in_pasadena_ca.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/tevatabezidulefavuguvoxeg.pdf
    • https://cdn.shopify.com/s/files/1/0266/8583/3405/files/empty_bottles_full_of_stories.pdf
    • https://cdn.shopify.com/s/files/1/0502/9462/0333/files/binumogedaxode.pdf
    • https://cdn.shopify.com/s/files/1/0483/1766/1339/files/23654041749.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9520/files/7713819866.pdf
    • https://cdn.shopify.com/s/files/1/0498/9331/0631/files/lekefuxetupedin.pdf
    • https://cdn.shopify.com/s/files/1/0268/7831/2625/files/rivunon.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/58535744964.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006837.bin
1fa2e7b3eec6c9bd8739b4490b53eb79be45087f3109db7614b5094fc9deeff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6837 5388 bytes
font_01_sfnt_off00007a6d.bin
c685d36ed28ed5e8fe00912285c39ca6554c02ceeda406ab77db2f24513d75b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6D 10196 bytes

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