Malicious PDF — malware analysis report

Static analysis result for SHA-256 6768c18fd7ddcd26…

MALICIOUS

PDF

39.7 KB Created: 2020-08-25 07:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e3872568d6bf24893b7fb3b7b31bc0 SHA-1: ae36b21d17bc282e7c46760384c527f40108c07e SHA-256: 6768c18fd7ddcd26f0062ff5939cf74b8c66fb8b9205fa887ca70ad9febc3620
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 Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, so the primary attack vector appears to be the embedded links.

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=pronouncer+guide+spelling+bee+2018
    • http://files.madeleinemacmahon.com/uploads/1/3/0/7/130775279/7632510.pdf
    • http://savimopad.mrsanntutoring.com/uploads/1/3/1/3/131380999/53cb4480a.pdf
    • http://files.secondchancesurrogacy.com/uploads/1/3/0/8/130813054/23bdb1356b88439.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/jafiwelobaxelot.pdf
    • https://cdn.shopify.com/s/files/1/0432/2911/8627/files/xowokufo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2695/files/nonegupumidu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/mudageviditusonenoxuxiluk.pdf
    • http://files.agrawal.people.ua.edu/uploads/1/3/2/6/132683289/rapuxasonamata_kitejewelasaf_fejebolorokomub_supapasivodid.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/wemefigesowokodap.pdf
    • https://cdn.shopify.com/s/files/1/0461/0955/6899/files/kedoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/7751/0055/files/pga._com_value_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/4132/4184/files/apoptosis_review_article.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6299/files/39771958712.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/74029507978.pdf
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/blood_cancer_report_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/6912/9372/files/firefox_android_bookmark_sorting.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_off00005c2d.bin
431f7a74efc1a44d316c25809d6d33c940cd7e25d97d330050e0d1d6181f66fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2D 5692 bytes
font_01_sfnt_off00006f9b.bin
bc43c07deaecac7a26a0e0a8d98c92f49025e723433a25bdcb0c77d842b9ffed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9B 10008 bytes

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