Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ced11621e200b9a…

MALICIOUS

PDF

48.0 KB Created: 2020-08-14 14:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e00fc2fffcaea75a3b7d125c0540e44 SHA-1: 638e67630c654afa8f2db3e110b85338bf76e7ac SHA-256: 7ced11621e200b9a0f27805fb18b157107fa670c579d20d873a4a6a19142f4c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a Harvard MBA employment report, aiming to lure victims to a malicious site. The ML classifier strongly indicated maliciousness, and the PDF structure includes numerous links to external PDFs, suggesting a link farm or redirection attempt. No scripts were extracted, but the presence of embedded URLs and the redirector link are primary indicators of malicious intent.

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=harvard+mba+employment+report
    • http://files.decgallery.com/uploads/1/3/1/3/131384789/cc8b20d.pdf
    • http://pivax.santafesoapfactory.com/uploads/1/3/0/7/130776394/sibuvadojobemija.pdf
    • http://files.jrstonemasonry.com/uploads/1/3/2/3/132303170/0eca13b1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/xovigeduloluwezevet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2903/7219/files/46302149333.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/87266751133.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3755/files/puralaguwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/baahubali_1_tamil_movie_hd_1080p.pdf
    • https://cdn.shopify.com/s/files/1/0432/8334/9657/files/68288711500.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/index_astartes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/liquide_amniotique_et_ses_anomalies.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/fujugureradunajebiguj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/boardman_22_function_bike_computer_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/xopiruzurijijewebekatun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b4f.bin
7d2ae6827c9986b4cd0c21e662feaeab980606282a692016aab418def68c92d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4F 4932 bytes
font_01_sfnt_off00007bf9.bin
41ec8efc8b06a62886c8bb76320dbc9336b09aef1940c82b142e0b0acd484358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF9 12796 bytes
font_02_sfnt_off0000a538.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA538 4324 bytes

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