Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a850f213661b8ef…

MALICIOUS

PDF

45.0 KB Created: 2020-08-18 12:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c0285c5c914f579b6ae49d11091fd1d SHA-1: e359191941d30d6c4bf32be491289d092692bc32 SHA-256: 0a850f213661b8efa868f2640f4f29799cefb388c82a11f3ec8597fd452e056d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains text related to 'chemistry test tube powerpoint template free' and includes the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. 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.cc/pify?keyword=chemistry+test+tube+powerpoint+template+free
    • http://files.jacksonwfchu.com/uploads/1/3/1/1/131163761/c40ec6b8ed1.pdf
    • http://kowakuwog.pillywigginsgarden.com/uploads/1/3/0/8/130874478/ganefotajev_jefokomexem.pdf
    • http://files.thatssodough.ca/uploads/1/3/1/3/131398093/vepenumaki-kozadefuwexul-modutokegeso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/kumatedupojel.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/crocodile_rock_elton_john_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/0650/0769/files/tinkle_comics_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1268/files/80962624851.pdf
    • https://cdn.shopify.com/s/files/1/0446/9909/1098/files/linux_mint_best_reader.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/88577018253.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/78648990707.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/kipadarozev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/buzusabokov.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_off0000648e.bin
dbcc6ea78844667e9a33d1d706d42fc7a82ae467169d8acc4171b0f0ab0f34e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648E 5380 bytes
font_01_sfnt_off000076be.bin
ca7d918ac2f0aca8a3b36903b33d8bb9b503cc96a1a9fa3f479496dbc61314ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BE 9860 bytes
font_02_sfnt_off00009881.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9881 4324 bytes

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