Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa6c110ec2ad5e3…

MALICIOUS

PDF

43.4 KB Created: 2020-08-25 12:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bdd01acc25a6185c3ea576db04064eb SHA-1: 3b1d561c8ef5276439d5797700c480a8efa26145 SHA-256: 5aa6c110ec2ad5e34efe75f344a1cd06f8fd4cefe0c6d01f1a9e9402f4df694f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Epson printer envelope template' and a URL that is also present in the heuristics, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious.

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=epson+printer+envelope+template
    • http://navonu.pezzlawncare.com/uploads/1/3/1/0/131071157/tadilifozosub.pdf
    • http://jojuw.art63lynch.com/uploads/1/3/1/4/131406436/vivew.pdf
    • http://files.poplarchapel.com/uploads/1/3/0/9/130969655/meganopadiru_sugokezas_bemoruguw.pdf
    • http://files.yogatreeonthecoast.com/uploads/1/3/1/3/131382395/gebipetuw-lefesawoga-lafipumusiwamu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6911/1448/files/35655738691.pdf
    • https://cdn.shopify.com/s/files/1/0447/9975/4397/files/fine_aggregate_in_concrete.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/28637985210.pdf
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/c_copy_constructor.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/73327663511.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/grammar_lessons_for_high_school_students.pdf
    • https://cdn.shopify.com/s/files/1/0439/1727/9400/files/tamilnadu_forest_apprentice_answer_key_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29883534071.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/wozozixuwipadenoguji.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6882/files/53193658744.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/fewova.pdf
    • https://cdn.shopify.com/s/files/1/0437/6707/0877/files/38392946492.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_off00006a22.bin
494e5ea5187d5af9c8fc077a74cf2a79379df9a1433494c395eaf01dc544d2ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A22 4980 bytes
font_01_sfnt_off00007afb.bin
40d3b7c825fa31e24a273e00039ce72637acc880fe80554b29da063933fd718b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFB 10620 bytes

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