Malicious PDF — malware analysis report

Static analysis result for SHA-256 781061e9fdde5d39…

MALICIOUS

PDF

41.0 KB Created: 2020-07-31 21:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8af311b5d08c2e4c54ccd4cb61d3294 SHA-1: 34cc894bc568ba22fae46aaef1bc9ce0505bceca SHA-256: 781061e9fdde5d39493934ce4ad4c306f88c82cae74bdfe97edea045d995b01f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious redirector URL and several benign-looking URLs, likely to mask the malicious intent. The primary goal appears to be directing users to malicious infrastructure.

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=js+socket+room
    • http://files.greaterheightsfellowship.org/uploads/1/3/1/6/131636737/3945625.pdf
    • http://files.newbeginningsequinestables.com/uploads/1/3/0/9/130969300/jawadixavebejab-pizuri-zapotak.pdf
    • http://files.drachenspiel.ca/uploads/1/3/1/4/131413678/c0c347ac8051923.pdf
    • http://files.gransstaystrong.com/uploads/1/3/0/8/130874593/98b40a.pdf
    • http://files.customizedtriptofrance.com/uploads/1/3/0/7/130776406/3234898.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4772/1892/files/nixiseponupemibitunakukuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/vofesigon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kipisoluni.pdf
    • https://cdn.shopify.com/s/files/1/0431/5358/8390/files/91098503059.pdf
    • https://cdn.shopify.com/s/files/1/0432/7617/3472/files/22219587910.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/59789690443.pdf
    • https://cdn.shopify.com/s/files/1/0438/2582/3904/files/20090259012.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1534434062.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/75223870304.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/lavizusidujabanoduwol.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/83485092509.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_off00005ea9.bin
f137a2d675b9402104f70c133f1d2b29038f28cf1e15051dcb2437d3d514535a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA9 4756 bytes
font_01_sfnt_off00006ec6.bin
125b33ec6d04230d24768728d41115c395bf15953a0ac2bc7d1be44cab191db8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC6 13152 bytes