Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eddc48bf4c83f15…

MALICIOUS

PDF

43.3 KB Created: 2020-08-22 03:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa9a1e38f105aa5bca6998de24f5ce3 SHA-1: 7150a20f4d3702077055b879cc07ad4b36f039c0 SHA-256: 2eddc48bf4c83f15843f3f9365856c016bc14fddac9998b64c07d5c8bcc5788f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is presented as an educational worksheet. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=esl+future+in+the+past+worksheet
    • http://files.ctdistrict4.com/uploads/1/3/1/3/131379894/5550009.pdf
    • http://dodeso.allisonwiserpianist.com/uploads/1/3/1/3/131383544/kawidepato_fevefifozoko.pdf
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/aviso_de_privacidad_telcel.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/xevuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/gullivers_travel_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9783/files/official_backgammon_rules.pdf
    • https://cdn.shopify.com/s/files/1/0441/2869/8520/files/husqvarna_435_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/1262/0447/files/mudafakopaxijuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9910/files/cambium_force_180_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/morfologi_diphyllobothrium_latum.pdf
    • https://cdn.shopify.com/s/files/1/0438/1127/4914/files/47196926018.pdf
    • https://cdn.shopify.com/s/files/1/0446/3286/6979/files/55107653818.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6615/files/notolozusala.pdf
    • https://cdn.shopify.com/s/files/1/0438/4315/8166/files/babuvofaku.pdf
    • https://cdn.shopify.com/s/files/1/0445/6854/3396/files/printable_alphabet_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0436/9563/6633/files/correcting_grammar_in_sentences_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/80607127373.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d7b.bin
3ad7d1883895f59612906f976bcb694011f638ee8c09ba7f7580fd4015e65774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7B 5100 bytes
font_01_sfnt_off00007ed6.bin
0a4f797bb8564cd2b806e55048a00e7da5a623e15d400570e4eb69469f39e503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED6 9852 bytes

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