Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec5fc99fc88f516…

MALICIOUS

PDF

50.4 KB Created: 2020-08-24 08:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b9202db0aad3c44265cdbae2bbfb3e1 SHA-1: 458cb55ea8043471f15115fd69b1bcb92713d5ad SHA-256: 6ec5fc99fc88f516d9085ddfaa5a8a47d68371deae22082147928051747963c5
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The presence of a "download button" lure and a large number of embedded links, many pointing to Shopify, suggests a phishing or scam attempt. While no scripts were extracted, the redirector link is the primary indicator of malicious intent, likely leading to a further stage of attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=critical+ops+for+mac+free
    • http://files.wecreatestars.com/uploads/1/3/1/4/131437848/xavamitokuxu.pdf
    • http://files.mlcw.org/uploads/1/3/1/4/131452982/waxeritotepunoririr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/8842/9724/files/autonomy_mastery_purpose.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3030/files/range_tank_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3821/files/zakijubozinisodipav.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/bujixotepuwinolopuxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/37939633120.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3047/files/chiang_mai_travel_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/kimoselugazexaxatefam.pdf
    • https://cdn.shopify.com/s/files/1/0438/3775/1456/files/33149822365.pdf
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/blink_malcolm_gladwell_free.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000653e.bin
eba0fd2a39740ef70f271ba177cb163761e7a8265e5e510506d48f5f2ba380e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653E 4864 bytes
font_01_sfnt_off000075c6.bin
202b381f23d309ce2a9d66dd984cd596eaf5bb3619c46db00d5cd643a34dfac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C6 10804 bytes
font_02_sfnt_off0000994f.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x994F 16204 bytes
font_03_sfnt_off0000ae7d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7D 4324 bytes

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