Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2d10b0d68f3897…

MALICIOUS

PDF

37.7 KB Created: 2020-08-19 22:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e656f7974042c4fd46c5a503f1696fce SHA-1: 1f9a6f14c1c8ec6c16c2d1f43bcb9beddb850d89 SHA-256: 4d2d10b0d68f3897959caa3958f770e9f0be13213f4485b25a3d86423d013323
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or malicious content delivery attempt. The document body, though heavily obfuscated, contains text related to 'long vowel sounds worksheets 1st grade' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious nature of this PDF.

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=long+vowel+sounds+worksheets+1st+grade
    • http://files.songsandmemories.com/uploads/1/3/1/6/131636946/bakifusugo_xamalipiloluv.pdf
    • http://files.thezhanggroup.com/uploads/1/3/0/8/130874524/jexubuzam_lefagasiwo.pdf
    • http://files.apolloartists.net/uploads/1/3/1/3/131380456/6502523.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8310/files/89850740823.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/toyota_forklift_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5159/files/35297399858.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/jekarupozadogu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/33330972937.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/ribed.pdf
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/disegafegapitutejeme.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/rudarovogovog.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_off00005693.bin
92acfa15db8012828bbce20c48e2233d8ae4190dd1174b244b4ce4ddd6404929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5693 5296 bytes
font_01_sfnt_off000068ad.bin
1777afbed5b045d0efeb983ae8d74c88df101b166993e15ef881bdb3364a5bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AD 9624 bytes

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