Malicious PDF — malware analysis report

Static analysis result for SHA-256 815e08ca2747ecd8…

MALICIOUS

PDF

39.5 KB Created: 2020-08-03 21:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f559f47b14995c42ed23f37d4a770a3 SHA-1: 0b310f1707c52f2ca037043852c57c621b1b8587 SHA-256: 815e08ca2747ecd8765e93a2402a73c627a7b45302e4cdb5f8457c1e3378c195
154 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to external resources, a common tactic for SEO link farms. One prominent link, 'https://ttraff.com/wb?keyword=programa%20para%20convertir%20jpg%20a%20pdf%20gratis', is flagged as a malicious redirector. The document's content and structure suggest it's designed to drive traffic to potentially malicious or spammy websites under the guise of a utility. No scripts were extracted, but the presence of embedded URLs and the heuristic firings strongly indicate a malicious redirection and link farming scheme.

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/wb?keyword=programa%20para%20convertir%20jpg%20a%20pdf%20gratis
    • http://files.thunderhawkcaucasians.com/uploads/1/3/2/6/132695339/9acda9d59b5.pdf
    • http://files.chrisdorsett.com/uploads/1/3/1/3/131383648/bozorobitasosam_ronurisos_vurota.pdf
    • http://files.dlrconstructionco.com/uploads/1/3/1/3/131398140/zutaxuli_lemiwigu_sifubogedufesak_gonev.pdf
    • http://files.brittanysoutlet.com/uploads/1/3/1/4/131409385/juwiwijof.pdf
    • http://files.mairibudreau.com/uploads/1/3/0/7/130776864/ziwawajobigogefivane.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2739/0887/files/1116227662.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/xasomurul.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8244/files/14026602174.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/kuxitikato.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/vulabod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogudanivivakow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/75213192471.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/zasasov.pdf
    • https://cdn.shopify.com/s/files/1/0432/6319/7347/files/58394653297.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/pafixazatajipizoraso.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/dokulituvorikisosepifag.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/zopozus.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_off0000579b.bin
41c681938b77c45117a874cd37134977e9b53ef4eb71f55f67232a1fd7b573ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x579B 5580 bytes
font_01_sfnt_off00006a8a.bin
1d1d989376689b1700eec8f8d8e8f2f083f13a7f2158ae428777a2e0e34964aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8A 11252 bytes

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