Malicious PDF — malware analysis report

Static analysis result for SHA-256 801cb0b6aa7e9e51…

MALICIOUS

PDF

52.6 KB Created: 2020-08-12 01:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a1448f7ec2d438607686a487bce3379 SHA-1: f5c87f73b9903eeb0bf217a11859227e6307c990 SHA-256: 801cb0b6aa7e9e5118f327a53e4641467f881afe6741885b217e7b713c702155
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a textbook download. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger link farm designed to attract traffic. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly indicate a phishing or scam attempt.

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=social+and+personality+development+6th+edition+pdf+free
    • http://files.newparkclosefrc.com/uploads/1/3/0/8/130873893/vakelurogupazi_surezu_balakekuwasen.pdf
    • http://files.crosscountryfarm.net/uploads/1/3/0/8/130813548/womunarovirimaxigoge.pdf
    • http://wagixoves.maryfarrfineart.com/uploads/1/3/1/4/131483281/26b5d.pdf
    • http://files.bearsnbling.com/uploads/1/3/1/1/131163634/gotejezorekew_jenaw_janegutap_fivej.pdf
    • http://pemiwetu.bowleyconsult.com/uploads/1/3/1/8/131857315/vanufonup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/biological_classification_pogil_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/73801042762.pdf
    • https://cdn.shopify.com/s/files/1/0433/8004/8023/files/nuwani.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/acidosis_respiratoria_aguda_y_cronica.pdf
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/bankable_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/dudiwemixogedigef.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/voxijusefosabunevoxoden.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/gefamevarifafafis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/53598799223.pdf
    • https://cdn.shopify.com/s/files/1/0431/3432/0794/files/fitenimupaxat.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/hotel_standard_operating_procedures.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/rikodorigepufunovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/89663944428.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7476/files/miwofunavakelutumapefago.pdf
    • https://cdn.shopify.com/s/files/1/0437/4636/1505/files/foxorefoluravowez.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_off00008cb8.bin
633393d75b46a12c1806f6ec0b8aa18c3c5b4ca75c3d15b8ce4579c318dd6273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB8 5812 bytes
font_01_sfnt_off0000a055.bin
c71dca47095280e581e59105754fd6d729ab00975683ed417bd761252ee9b102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA055 10536 bytes

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