Malicious PDF — malware analysis report

Static analysis result for SHA-256 313eba06a00d3801…

MALICIOUS

PDF

44.9 KB Created: 2020-08-15 00:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef74dab65e83769b0ee2c43a740e6a1f SHA-1: 42e61d07da05d4a00b1782d888e896be136933cf SHA-256: 313eba06a00d38013139fc1655ef073a239f37a80b785eb48f4690ec49947966
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, disguised as a list of 'Ofac sanctioned countries'. The document body is heavily obfuscated but contains the same lure text and the malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to attract search engine traffic and distribute malicious content.

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=ofac+sanctioned+countries+list+pdf
    • http://files.sfihs-sfusd.com/uploads/1/3/2/7/132711947/ximugabutasebuvari.pdf
    • http://besepe.bakerlawga.com/uploads/1/3/1/0/131070458/ripesisojisakugomav.pdf
    • http://dojuke.wildgingerdaycare.com/uploads/1/3/0/7/130776078/b06561278.pdf
    • http://kisalam.laughingkookaburracottage.com/uploads/1/3/0/8/130814328/vezojoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/0054/2878/files/ap_grama_sachivalayam_results_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/printable_celtics_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/23074546094.pdf
    • https://cdn.shopify.com/s/files/1/0435/5011/3943/files/38585861725.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/48293663456.pdf
    • https://cdn.shopify.com/s/files/1/0434/6678/4932/files/vegamoxolinegavaxujexoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/46074230022.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19836568605.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/webini.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/63777604479.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/97252991339.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7056/files/47318482984.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071db.bin
8c87d679586462a317a4d00a087a9a003875e7c236e96dfb168f85e45f2c20ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x71DB 5176 bytes
font_01_sfnt_off00008383.bin
1482ed0995d60772433f3a7e8574aa31e9f23704ff0fe31844a3c9c8a29fffed
pdf-font-stream PDF embedded font (sfnt) at offset 0x8383 10248 bytes