Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ffe6d428824909…

MALICIOUS

PDF

46.2 KB Created: 2020-08-05 01:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f319ba2edf0998f613818ac1c7bc6197 SHA-1: d8fdf668015fce84d11d9259128beb2ca53b1ede SHA-256: 78ffe6d428824909d20e031859c56d2ed2a58a40282c47b84fe2f5b69d68ebde
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm or SEO poisoning attempt. One of the primary links, 'https://ttraff.cc/pify?keyword=adverbs+of+time+exercises+with+answers+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise malicious content.

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.cc/pify?keyword=adverbs+of+time+exercises+with+answers+pdf
    • http://files.thegovernorspub.com/uploads/1/3/1/4/131453718/sufinadaxub-xebarujut-vepesupez.pdf
    • http://files.thelatestmews.com/uploads/1/3/1/4/131453022/766915.pdf
    • http://files.ramblinghouseshow.com/uploads/1/3/1/3/131380000/6ddd229d5e77.pdf
    • http://files.goldenageoffilms.com/uploads/1/3/2/7/132740598/3295011.pdf
    • http://files.octobermoon.shop/uploads/1/3/1/4/131438490/tuzidavidumenipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/4235672026.pdf
    • https://cdn.shopify.com/s/files/1/0433/3223/9528/files/wenosuguzulinawugajexew.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/sikewesije.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/56159436760.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/86122573034.pdf
    • https://cdn.shopify.com/s/files/1/0434/8297/2326/files/rugakagop.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/clasificacion_de_los_seres_vivos_whittaker.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/email_writing_for_class_8.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/77564797331.pdf
    • https://cdn.shopify.com/s/files/1/0431/9520/3745/files/49556634374.pdf
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/41544769173.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/kixewo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/65730563868.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/que_es_psicologia_clinica.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000682e.bin
1e605dc8cfbeb3a770cb028041722acf63e530ab3cc8628e08025390b73a2d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682E 5500 bytes
font_01_sfnt_off00007ac5.bin
60c32dc1dc615988b84817db8154691fd3e3f1bcc8ace0d0f05e44acc101dd5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC5 10148 bytes
font_02_sfnt_off00009d41.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D41 4324 bytes

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