Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a274cf918e2eda…

MALICIOUS

PDF

58.6 KB Created: 2020-08-09 19:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c3f9eb40382a5d90c0680129e081b60 SHA-1: 84d27b29fb0c311ccc64751aa4b0c4a92b4bcc40 SHA-256: 39a274cf918e2edab2468fc4ae631648c1d15da98a3ce3f6dd56ae76a492db8d
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure related to book reviews, likely to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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=the+adventures+of+tom+sawyer+book+review+pdf
    • http://files.kentchancpe.com/uploads/1/3/0/9/130969489/wewubiwufakime-rejanobumefatu.pdf
    • http://files.presbyterianpreschoolec.org/uploads/1/3/0/8/130874582/kawibizoxobos.pdf
    • http://files.vivalavisa.net/uploads/1/3/0/9/130969204/nugikimivebokew_viwajewowolisev.pdf
    • http://files.jimmylbryanjr.net/uploads/1/3/2/8/132816036/zaxuv.pdf
    • http://files.biopeakgenetics.com/uploads/1/3/0/9/130969231/batupijavonanit-sirusetukiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3380/files/investment_management_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/54483694809.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/54120514246.pdf
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/32117086738.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6551/files/dropbox_unshare_folder.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/save_for_web_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/golalebilafofuzugetuvi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9802/files/93744533217.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/23533903343.pdf
    • https://cdn.shopify.com/s/files/1/0434/4469/9288/files/41867078767.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/77194667701.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/61732991151.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_off0000a60e.bin
f0905f765920637a982fcf680e52326e70422401edb23624a8bac0350a28826e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA60E 5656 bytes
font_01_sfnt_off0000b937.bin
06d27a56bc6410192d0ea5230d32b530e1791a41c8c6cb2e683ec46189f5dec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB937 10428 bytes

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