Malicious PDF — malware analysis report

Static analysis result for SHA-256 7976456a024f35bd…

MALICIOUS

PDF

40.2 KB Created: 2020-08-11 13:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 730c61cc7cc0b1e23a3a9deec198f1ff SHA-1: 089b82349388c380eb920b68251f8aef1fe2a92c SHA-256: 7976456a024f35bd5f19420c77abe6cd8d684225991cce35b24155184011bf7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests an attempt to lure users to a malicious site, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

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=asnt+tc+1a+2020+pdf
    • http://files.centerpointschool.org/uploads/1/3/1/0/131070137/zumurirofe_solelafipawo_nopokupi_bolilejidi.pdf
    • http://files.hawaiianislandjewelry.com/uploads/1/3/2/6/132695741/7331237.pdf
    • http://files.erikahope.com/uploads/1/3/0/7/130740033/5784517.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5572/7260/files/60414371359.pdf
    • https://cdn.shopify.com/s/files/1/0429/3607/4396/files/buvekadesigad.pdf
    • https://cdn.shopify.com/s/files/1/0429/0831/9903/files/tonexodedegekogaxasazuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/64867924223.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8893/files/posthumanism_a_critical_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/electronics_and_communication_engineering_core_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0434/7510/7992/files/laporan_amdal_rumah_sakit.pdf
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/actions_actors_thesaurus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4902/files/wikikepubu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0437/7763/files/surawuwolukerageded.pdf
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/banebupov.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/programming_concepts_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0438/2566/0066/files/rational_and_irrational_numbers_worksheet_with_answers.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_off00005f5e.bin
d3c032fc42694228d5598cb310c928fb50923f4b5e2778992cc240dfa940198c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5E 5336 bytes
font_01_sfnt_off00007198.bin
ce15c8424ba8b2049c1e0807ccff4ef61a17f12ed65425184f6c40290aa186f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7198 10164 bytes

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