Malicious PDF — malware analysis report

Static analysis result for SHA-256 722e5667bc43924d…

MALICIOUS

PDF

35.9 KB Created: 2020-08-10 08:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41dd7c3a6d4898e29fa21009f6b5447b SHA-1: 73a66608cada328e2dc0c62d1a715710a63ab37d SHA-256: 722e5667bc43924dd5592f1cf17e286cfa8472d768e972de3f8b2c08a177fecf
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'epaper' to entice users to click the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion of an SEO spam or phishing 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.ru/pify?keyword=andhra+jyothi+epaper+guntur+district+edition+pdf+today
    • http://todurada.mdstec.net/uploads/1/3/1/4/131453574/wikuzeduz.pdf
    • http://files.cheffreshgrabngo.com/uploads/1/3/1/4/131406840/3372909.pdf
    • http://files.jonfielder.com/uploads/1/3/0/7/130775434/d416d5829525.pdf
    • http://files.goodshepherdsfoundation.org/uploads/1/3/1/4/131453588/nogupuxopegibiwaji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/28685543346.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/moguvizagirijebulufiwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6594/files/exercices_corrigs_les_bascules.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/32194132809.pdf
    • https://cdn.shopify.com/s/files/1/0439/4464/0667/files/92195383886.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6480/files/guitar_arpeggios_practice.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/puzizesukubesapuwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8236/files/xagisaguxis.pdf
    • https://cdn.shopify.com/s/files/1/0441/2293/1352/files/daniwadilituj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/99260922154.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_off000042df.bin
84e46e3cf898de3df30ef1718ff9d6d53e4aac9a1216eed062e98792da9f25af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42DF 5436 bytes
font_01_sfnt_off0000555d.bin
35352503d44e26a9d603bc04bdc0d492a7b7119b4ba432699f735651397d16ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x555D 8972 bytes
font_02_sfnt_off000073fe.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FE 4324 bytes

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