Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1350906fcbfd70…

MALICIOUS

PDF

48.3 KB Created: 2020-08-21 22:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 894c8170d54f9c6a015c91159e0fea6b SHA-1: 84e9d44c9cbb0cd7812004def70cfc737131f721 SHA-256: 7c1350906fcbfd700f64ce486da15431575f09646a4e110b4c66e7439d572d7d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which are algorithmically generated and point to external resources, including a known malicious redirector. The document body suggests a lure related to "2019 tamil movies hd free", which is likely intended to trick users into clicking the malicious links. The ML classifier strongly indicates maliciousness, and the presence of multiple PDF link farm heuristics further supports this assessment.

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.
  • 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.
  • 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=2019+tamil+movies+hd++free
    • http://files.alibarker.com/uploads/1/3/2/7/132740871/2711329.pdf
    • http://files.destinytool.com/uploads/1/3/1/8/131857602/265126.pdf
    • http://jufiwup.hiddendragonmartialartsacademy.com/uploads/1/3/2/6/132681352/xasexerupidixemijoko.pdf
    • http://xonaxuga.thebridgeyouthcenter.com/uploads/1/3/1/3/131379615/1699006.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/nawuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/wivoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/nsp_bonafide_certificate_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/2695/4905/files/my_abc_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2518/files/miwagoxetabivasukewevad.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/kujedapisukizi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7948/9950/files/aut_aut_kierkegaard_libro.pdf
    • https://cdn.shopify.com/s/files/1/0429/1896/9507/files/gexosubenebisomitogin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lejozusuxawunulimedobina.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/230443439.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/bosigozu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/12854702086.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/3269897245.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_off00007dab.bin
46701abd236edd4ef5d152d3147c99cd0dde4b22ee585d2e33083a747f7fedb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAB 5596 bytes
font_01_sfnt_off00009086.bin
c39d7f740bcf20afe45e37fe7a71614c566ce425c826a3cb4609745107e26c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9086 10364 bytes

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