Malicious PDF — malware analysis report

Static analysis result for SHA-256 61babff2e626a539…

MALICIOUS

PDF

52.2 KB Created: 2020-08-31 01:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2470b132e5b2ec30ce0457fd46506739 SHA-1: 87eab610fd600b3eae2c3a50bbb50d3be07bdf8d SHA-256: 61babff2e626a539417c4903d4cce3da59a594624217574f9bb42dbbedbe9e91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for malicious redirector links, pointing to a URL that appears to be part of a link farm. The ML classifier also strongly indicated maliciousness. The embedded URL is likely intended to lure the user to a malicious site, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/wix?keyword=shingeki+no+kyojin+105
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7357/5841/files/tylenol_500mg_bula.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2541/files/block_spotify_ads.pdf
    • https://cdn.shopify.com/s/files/1/0447/1400/0540/files/computational_complexity_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/92362567899.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/long_war_rebalance.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/stopniowanie_przymiotnikw_angielski_wiczenia_dla_dzieci.pdf
    • https://static.usrfiles.com/ugd/8ba634_7957d2f4f6a842f7bf753fb194b5f6ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb2c15093a80485a9d851f595bd3b2e4.pdf
    • https://static.usrfiles.com/ugd/87d215_202b62d520c84046ba248a63e8a9395f.pdf
    • https://static.usrfiles.com/ugd/067ecb_40c1b4c69da84ca29c2dedbfbf046e2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b89d1339c7be4540bef989657ddeba12.pdf
    • https://static.usrfiles.com/ugd/5b9a87_00f6f9229fed43a5864f97fec8670d11.pdf
    • https://static.usrfiles.com/ugd/b914b5_a5f5088044434c6990da70f23ef59937.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6a1dd58cfee42ee9a569df62f8afcd9.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006334.bin
c42dac5a892d0c0667ac8f468d5b1ef5fc217639dd74b2acc472a22dad3ee95f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6334 3372 bytes
font_01_sfnt_off00006f45.bin
6cc07a9c971bfe71fc025088957c7d8fbab1db9162801404aa56786df5b0790f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F45 5096 bytes
font_02_sfnt_off000080ae.bin
c879d4b0210e847162f2c6d686728d124bd1d841235a0c83932700cac93a3561		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AE 1852 bytes
font_03_sfnt_off000089a0.bin
2d75b0cc1d6f1161e041f96f06909f9310586dd655b7469378e9293dbe44b54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A0 10372 bytes
font_04_sfnt_off0000acdd.bin
7ff8585f0452229cf00b15a46bd75f5b2cf9abf22a9fa8d7aa6566e1f297882a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACDD 16708 bytes

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