Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d20cd60449d67a…

MALICIOUS

PDF

51.2 KB Created: 2020-07-31 23:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4909b2f187b3fc7118156def4ccb8714 SHA-1: 2737b75c44257e3cac041ff7a66fff4ddbcaa900 SHA-256: 62d20cd60449d67a3465da579c9689b66984700964bdd915a8c4e69826f3df4d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which likely serves as the initial stage for a malicious payload. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious activity is the redirection to external, potentially harmful, URLs.

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.cc/pify?keyword=relic+douglas+preston+lincoln+child+pdf
    • http://files.shopmabels.com/uploads/1/3/1/4/131407459/d6e835e052cea73.pdf
    • http://files.storiestoldbyholly.com/uploads/1/3/1/6/131607163/9343868.pdf
    • http://files.modernebarnwine.com/uploads/1/3/2/6/132681517/2737164.pdf
    • http://files.letsdansky.com/uploads/1/3/1/4/131406075/jojekoru_bowaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/12177161450.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/71233390284.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48787523288.pdf
    • https://cdn.shopify.com/s/files/1/0435/1387/2548/files/fiten.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1039/files/virijidunonanozowadobafe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/97638081637.pdf
    • https://cdn.shopify.com/s/files/1/0435/5240/7704/files/sosika.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/affidavit_of_loss_template_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rodol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.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_off00008b07.bin
a74abe4c9f5c50247c1d9655564cad37c4adec05ff4dc997eb7a7136acf86b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B07 5424 bytes
font_01_sfnt_off00009d7d.bin
9221ea45e5420ea6abcb89f3daf5598143efe988cb326072a03ef98860c6567c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D7D 10144 bytes