Malicious PDF — malware analysis report

Static analysis result for SHA-256 71aba7bee73fc13d…

MALICIOUS

PDF

44.9 KB Created: 2020-08-10 07:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f2b281ca6dabf7e6940c30a6144d345 SHA-1: de49f5f1b1d9e8806d07cc2cb5416b53919d8294 SHA-256: 71aba7bee73fc13daeae7d7f4bf0e254e2fbfa4b617db61bda3d391f0db42572
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for users to click a download button. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt.

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.com/pify?keyword=candy+convertitore+pdf+word
    • http://files.oneworld-wellness.com/uploads/1/3/0/7/130775558/1897286.pdf
    • http://files.raoulpacheco.com/uploads/1/3/1/4/131407921/9328959.pdf
    • http://files.predictingfuturebricks.com/uploads/1/3/2/8/132815015/9677699.pdf
    • http://files.eastwestmassagestudio.com/uploads/1/3/0/9/130969059/mipakaximixusituxib.pdf
    • http://venifona.secaucustower2.com/uploads/1/3/0/7/130739204/4099205.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3956/2651/files/68607714218.pdf
    • https://cdn.shopify.com/s/files/1/0439/3874/2430/files/defatawadekokunalofetun.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/lidigizopokelozakexinemu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/serugen.pdf
    • https://cdn.shopify.com/s/files/1/0432/1784/6427/files/60480386689.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/16965725087.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2680/files/13035414677.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/82872032404.pdf
    • https://cdn.shopify.com/s/files/1/0428/5431/8239/files/89449714839.pdf
    • https://cdn.shopify.com/s/files/1/0433/5278/5055/files/96855773926.pdf
    • https://cdn.shopify.com/s/files/1/0431/8091/6893/files/bank_promotion_books.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/wovevax.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/xalowewiziju.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/lagujefixikogilonijegoso.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_off000071ff.bin
ffdb233565f8b5e01b71aa517baec4f84aabd908711da3283cbe56f02e0aab2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FF 5100 bytes
font_01_sfnt_off00008383.bin
4c4fe01f3b3f2c875723ad1d8241a616394aafd74df3c56442db331217caa3ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8383 10112 bytes

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