Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a52bdc2a72a7460…

MALICIOUS

PDF

36.0 KB Created: 2020-06-06 11:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84b9628ca90a72555a89e8093794c50a SHA-1: 1684a7435669ddb78b3d82755aa3f9637ec1ccd7 SHA-256: 5a52bdc2a72a7460d27c866d953b267e4c9beaaf9834a86fa8d3ebf1c94dcf51
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are algorithmically generated and point to other PDF files, suggesting a link farm or redirection scheme. The document body text and embedded URLs indicate a lure to download "Gta sa for pc free", likely a pretext to trick users into visiting malicious sites or downloading malware. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://bobvarneyphotos.com/uploads/1/3/0/6/130620948/130620948.html#gta+sa+for+pc+free
    • http://thefancyfrogboutique.com/uploads/1/3/0/8/130874433/nosoniwoxewu_jujawijukas_wexivixekekaja_punosatolebe.pdf
    • http://barefootlaneclothing.com/uploads/1/3/0/7/130739015/e66d686b61a8f35.pdf
    • http://rockchurchriverside.com/uploads/1/3/0/5/130543877/4798417.pdf
    • http://dmomentum.com/uploads/1/3/0/2/130272102/c01cd12a5956345.pdf
    • http://apartmentlocatorguruaustin.com/uploads/1/3/0/7/130775557/waxuzi-xixomabafodija-lenid-dinitepusefezig.pdf
    • http://eglisedecarlabayle.com/uploads/1/3/1/6/131606293/af5669382f.pdf
    • http://18700ridgeland.com/uploads/1/3/0/5/130588803/tuluraxo.pdf
    • http://cdude.com.au/uploads/1/3/0/7/130775916/1ce2afaa5ed.pdf
    • http://tasmichos.com/uploads/1/3/0/6/130621282/gunum.pdf
    • http://mindy.finnerty.communitydevelopmentprofessionals.com/uploads/1/3/1/6/131606402/birupid.pdf
    • http://victorjoelortiz.com/uploads/1/3/0/7/130776500/benenimidat.pdf
    • http://beckypixie.com/uploads/1/3/0/8/130874091/1eb5472ebc9ea02.pdf
    • http://bobvarneyphotos.com/uploads/1/3/0/6/130620948/terms.html
    • http://bobvarneyphotos.com/uploads/1/3/0/6/130620948/dmca.html
    • http://bobvarneyphotos.com/uploads/1/3/0/6/130620948/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://julaxotetelu73207895.files.wordpress.com/2020/06/47594775289.pdf
    • https://lawalizawav666090560.files.wordpress.com/2020/06/89899051766.pdf
    • https://kilusedurab.files.wordpress.com/2020/06/25833219035.pdf
    • https://bokisutedex.files.wordpress.com/2020/06/wokemitoniliriju.pdf
    • https://vuxadowemej.files.wordpress.com/2020/06/kutuwuso.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006109.bin
9aa5b16b64300bd45db52c734a50fcfdae069e75e0571c0678ccd6a48207d50e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6109 10380 bytes

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