Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5a875b2183a984…

MALICIOUS

PDF

60.8 KB Created: 2020-08-08 21:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc3899f978726920d75a00da8049225b SHA-1: 4f5f7e34dcfe6ae2b86c31ca8571dca36fc5cdf7 SHA-256: 3a5a875b2183a984526f454bc08faa4ef9a76b199c243b810e736e703b8481fa
152 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.com, which is designed to lure users to further malicious content. The document body, though heavily obfuscated, contains the URL and appears to be a lure for a "math symbols list pdf". The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm for SEO poisoning or traffic generation. No scripts were extracted from this sample.

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=math+symbols+list+pdf
    • http://files.stokemodelclub.co.uk/uploads/1/3/1/4/131453260/manuwelutosifa.pdf
    • http://pugoxi.edwardschapel.org/uploads/1/3/1/0/131070161/7d32b116f9470a.pdf
    • http://files.jodyrathgeb.com/uploads/1/3/2/6/132681460/jomatekekivasi.pdf
    • http://files.neurothinktank.com/uploads/1/3/1/6/131606128/dusewomotaxike_pizewa_zopurirug.pdf
    • http://files.stokemodelclub.co.uk/uploads/1/3/
    • https://cdn.shopify.com/s/files/1/0437/8879/6053/files/73258996010.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/mepunakigotivoru.pdf
    • https://cdn.shopify.com/s/files/1/0448/1895/6448/files/army_sworn_statement.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2095/files/android_api_documentation_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8398/8125/files/scholastic_aptitude_test_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/34164685878.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/12322426666.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/56279295859.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/65121572511.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0532/files/open_g_tuning_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0430/3103/6053/files/38362966798.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96056065099.pdf
    • https://cdn.shopify.com/s/files/1/0439/5014/5704/files/sesax.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c62.bin
a46e238df99e637b968240162e683615f6b2972a65179302004c11d56036fc9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C62 4996 bytes
font_01_sfnt_off00007d65.bin
10815b2811a683f3358a894fe4f6a4884f20273e953accae669a7343238d799c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D65 19684 bytes
font_02_sfnt_off0000bb41.bin
735a5c5e608476047b0369670e7ff3da531db9966cdacc1e0a338daeed1ddef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB41 18036 bytes
font_03_sfnt_off0000d783.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 4324 bytes

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