Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1897ccaad089ac…

MALICIOUS

PDF

41.5 KB Created: 2020-08-12 12:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4ad47cb990c32634c47cffbefad1f8 SHA-1: bee30b06f16143a054d17be4526c461beb0a661b SHA-256: 0b1897ccaad089aca052a5bb309a04724ad284a8a77233d88a49f3b6a1c3fdd0
162 Risk Score

Malware Insights

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

The PDF contains a deceptive link that redirects to a malicious URL, disguised as IELTS study material. This is supported by heuristics indicating a malicious redirector and a link farm. The presence of embedded URLs and a call-to-action button further reinforces the phishing attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=makkar+ielts+speaking+pdf+2020+download+september
    • http://kenofire.yourglobalclassroom.net/uploads/1/3/0/7/130739430/zobijotugajemimes.pdf
    • http://files.goldfishprints.net/uploads/1/3/1/3/131380008/duwefo.pdf
    • http://dekuz.theaterinthepark.net/uploads/1/3/0/7/130775085/bexira.pdf
    • http://files.camelotballoons.com/uploads/1/3/1/1/131163737/7013599.pdf
    • http://files.ennishistory.com/uploads/1/3/0/8/130874667/a264d668111c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5021/3274/files/11122313391.pdf
    • https://cdn.shopify.com/s/files/1/0433/2417/8600/files/ielts_academic_reading_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/fufadobanujavejogefezuvu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/fisanofosad.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/71479786954.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/pivogubumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kirojaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/3323/0488/files/ffxiv_house_buying_macro.pdf
    • https://cdn.shopify.com/s/files/1/0434/2490/7414/files/73786756692.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lamafavikunidamekisuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/92835544334.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/fuxusazurotabuteba.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_off000061ea.bin
3e516493490fd2c69f55dd881d43f7ab5770cbf64eedfe4b2d7d5ea349473f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EA 5936 bytes
font_01_sfnt_off0000761d.bin
763a96a5db3f24d374f6053f360febfa297129de4d62d59ba8ac91199d71257a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 10236 bytes

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