Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e9b1cc00888fce…

MALICIOUS

PDF

38.3 KB Created: 2020-08-23 02:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3439a64b07be4351e9ad49f7f4346736 SHA-1: 24c0cfc892d104d859d74cabcbdb43dc3598a30e SHA-256: 85e9b1cc00888fcec12a2886258fa0ae18d785e874e5f048c2a3dd8fa9f2a4f9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm designed to distribute traffic. One prominent URL, https://ttraff.ru/pify?keyword=grams+kilograms+worksheets+2nd+grade, is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to educational worksheets, suggesting a lure to encourage clicks on the malicious links. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=grams+kilograms+worksheets+2nd+grade
    • http://wadaligig.kymosquitocontrol.com/uploads/1/3/1/3/131383483/707806.pdf
    • http://files.colleen-pearson.com/uploads/1/3/1/4/131438098/dupadituba.pdf
    • http://zoxuvipi.bbdcnj.com/uploads/1/3/0/9/130969408/5218250.pdf
    • http://files.teachinghooks.com/uploads/1/3/1/4/131406344/673153.pdf
    • http://virewiwew.secondstoryhoney.com/uploads/1/3/1/0/131070894/bb3aa89b1b1acd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/94695387400.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/adobe_reader_9._4_5.pdf
    • https://cdn.shopify.com/s/files/1/0437/1546/1275/files/koputatasemolimaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0435/7357/5841/files/12119899670.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/free_apache_openoffice_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/19886773609.pdf
    • https://cdn.shopify.com/s/files/1/0447/7334/3383/files/carnivorous_plants_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5041/files/58775099545.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/21448884182.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/86364666579.pdf
    • https://cdn.shopify.com/s/files/1/0437/0812/1242/files/diputunipilizinonog.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_off000056da.bin
9724510bf64668e520d0157b19601ba849c3be3f2afcaa184280d663b79c1e69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56DA 5556 bytes
font_01_sfnt_off000069bb.bin
3c3071625a5055f75f5ac9d370943e3df14733e9934c6d82413d9e25d2f4eaaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BB 10044 bytes

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