Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c55b64898b583f5…

MALICIOUS

PDF

52.9 KB Created: 2020-08-28 01:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 222f41ec279cf499ca967648aed554c9 SHA-1: 93ec285c76cbdd097c034fe1c2595b8802318f43 SHA-256: 9c55b64898b583f5f39ce3a50ec21d4f96015f20d418c1d75124eea6247d28bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, identified as a link farm, pointing to external resources. One of these links, 'https://ttraff.com/pify?keyword=penberthy+sight+glass+manual', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a lure to external 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.com/pify?keyword=penberthy+sight+glass+manual
    • http://vepar.seedtothenations.com/uploads/1/3/0/7/130738950/vadetewagapora_dabit.pdf
    • http://files.bricdesign.com/uploads/1/3/1/8/131871909/d530bdf5.pdf
    • http://files.officevalue.net/uploads/1/3/2/8/132814930/nedes.pdf
    • http://fezezogim.cambridgesupervisiontraining.org/uploads/1/3/2/6/132681337/divef.pdf
    • http://wikisuve.annimorris.co.nz/uploads/1/3/1/4/131407921/694b2fa2e.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/nuzisuteli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94766401197.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/63943655448.pdf
    • https://cdn.shopify.com/s/files/1/0435/7272/3875/files/124631482.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/25563029397.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/82202793434.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4642/files/fetogugobezul.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/beginner_piano_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/delidupupukomojik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4453/files/property_agency_agreement.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_off00008bb6.bin
d7507dd152e3082b5d1bf164c6ca7abefe2f628bf412b61c0a1a96653b96e100
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB6 5340 bytes
font_01_sfnt_off00009db1.bin
5bc56a9ae98cbcd2356a1c3b7d00da0c8d974389bfc574d0ab6dbd48028005c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB1 12660 bytes