Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a70bf721e9f6fc…

MALICIOUS

PDF

46.6 KB Created: 2020-08-13 22:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbe4db7addb7a2eb0b2dc0c7ec5ef6dc SHA-1: f9892ddffd74f2a513700d1c83a57b36e5b77f31 SHA-256: 12a70bf721e9f6fc650e0d8228c23edc10f5d693171aef8ac70fdcad106767ca
154 Risk Score

Malware Insights

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

The PDF contains a prominent link to a known malicious redirector, disguised as 'Coaster creator pre lab worksheet answers'. The ML classifier strongly indicated maliciousness, and the PDF structure includes a large number of external links, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector strongly suggest an intent to lead the user to a malicious site, likely for phishing or further malware delivery.

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.ru/pify?keyword=coaster+creator+pre+lab+worksheet+answers
    • http://files.nationssleeps.com/uploads/1/3/1/4/131409037/libusituv.pdf
    • http://bewex.spiritedshepherds.com/uploads/1/3/2/6/132682541/xamaz-nirerukuva-bufutatuzif.pdf
    • http://zaminutef.kingguideservicearizona.com/uploads/1/3/1/6/131606569/xotarevum-fotub-ximoderoku-gorozibulitid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/4245/6231/files/80447902868.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/zusawiwototikewadirelipa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/abituriyent_jurnali_2020_kecid_ballari.pdf
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/anatomy_drawing_school_human.pdf
    • https://cdn.shopify.com/s/files/1/0438/2402/1664/files/fanosejujerabatid.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2534/files/advanced_algorithmic_trading_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/kivukinojapuloxa.pdf
    • https://cdn.shopify.com/s/files/1/0440/8187/3048/files/how_to_convert_to_word_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4839/files/pro_tools_le_8_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/konekebavajese.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/bopelivilelasirejuxamen.pdf
    • https://cdn.shopify.com/s/files/1/0438/4522/2557/files/utc_to_cst.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_off000069dc.bin
af7561b6b8b896f6bafe4ab55f32e62378296de60d5e850a537801744b76671d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DC 5080 bytes
font_01_sfnt_off00007b1e.bin
9aa15718060849c8ebe7f98654b2eaa3e05672479cc46cfc7a40b7dc0c2dd19c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1E 10436 bytes
font_02_sfnt_off00009ee3.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE3 4324 bytes

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