Malicious PDF — malware analysis report

Static analysis result for SHA-256 d524ad51cb5f8c1d…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 10:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e8f1d2a9f14d7ce2398f6b23c192115 SHA-1: 6da7fdcde99b18cfa78560f30e2fc9f939f448c0 SHA-256: d524ad51cb5f8c1d4f5a2109fcb6bddca607d1620566c438c589c76241061070
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it leads to known malicious redirector infrastructure. The primary lure appears to be a seemingly innocent topic like 'Allen bolt size chart metric pdf', which redirects to a link farm hosted on ttraff.com. The document body itself is heavily obfuscated, but the presence of the malicious redirector URL is a strong indicator of malicious intent, likely to lead the user to a phishing or malware distribution site.

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.com/pify?keyword=allen+bolt+size+chart+metric+pdf
    • http://files.tucsonmetaphysicsfair.com/uploads/1/3/0/7/130740231/9496354.pdf
    • http://files.avocadotoastfinance.com/uploads/1/3/1/4/131409090/d135510eb.pdf
    • http://linikosox.ashlandnaz.org/uploads/1/3/2/7/132740978/gavuwataxapimagudu.pdf
    • http://ramol.polonskyfilm.com/uploads/1/3/2/6/132680813/1c6fb63da.pdf
    • http://files.carlahope.com/uploads/1/3/1/8/131871762/xobakeruruxu_sixukasikirade.pdf
    • https://cdn.shopify.com/s/files/1/0429/7034/9731/files/34371028455.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/tetris_java_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4345/files/zamakisumiduzeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/a_flower_is_not_a_flower.pdf
    • https://cdn.shopify.com/s/files/1/0432/8888/7460/files/62761007481.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/43737318054.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/nexisepopupururofinalidu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3273/0017/files/wobove.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/rofat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/9954201362.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9607/files/jean_baudrillard_books.pdf
    • https://cdn.shopify.com/s/files/1/0436/8780/5081/files/inquiry_into_physics_7th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/mosuganivinubifabigap.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_off00006432.bin
2f69a90885620254023045f39b1cb6176a1775e4335900c21d86565651070dcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6432 5576 bytes
font_01_sfnt_off000076f4.bin
2348253388ef7d813d89447141fb4266b9af663726f27a73d7e61f2e89a473e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F4 10540 bytes

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