Malicious PDF — malware analysis report

Static analysis result for SHA-256 156b340664baab40…

MALICIOUS

PDF

56.2 KB Created: 2020-08-14 12:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5119d1e5ad573dca14fb4bcde32c9b0b SHA-1: 242568282b8b04e8b56d1881d3f539754222d9f3 SHA-256: 156b340664baab40d2e53f98711e3423a16d7f95e2c0c6992776575b869088dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to distribute further malware or lead to phishing pages. The document body, though heavily obfuscated, contains references to a syllabus and URLs, suggesting a lure to trick users into clicking the malicious link. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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=nctb+jsc+syllabus+2019+pdf
    • http://files.haywardfitnessfanatics.com/uploads/1/3/0/8/130874413/dugen.pdf
    • http://selepuzo.heddagrevleottesen.com/uploads/1/3/2/8/132814930/b502c0512d7da.pdf
    • http://files.symmetry-careers.com/uploads/1/3/1/4/131454699/razulil.pdf
    • http://pexuvid.yogasomething.com/uploads/1/3/1/4/131437402/lemefizelekenad_maxixip_dotut_xibetodu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5863/4650/files/44835195701.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/fobaxunumabagag.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/29765836922.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/innotek_dog_collar.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/meeting_attendance_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/3653/3151/files/59424275130.pdf
    • https://cdn.shopify.com/s/files/1/0440/2675/7270/files/91729586914.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2430/files/69831056538.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/tusiwovijidelutima.pdf
    • https://cdn.shopify.com/s/files/1/0438/8395/4328/files/4325628636.pdf
    • https://cdn.shopify.com/s/files/1/0433/3489/3718/files/26895379676.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/ano_ang_tanggol_wika.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/lru_cache_implementation_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/7895/9775/files/coleman_hot_water_on_demand.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a4b.bin
e4fc2bf3fc5954e5015179fe2a9bf59e47abf4a9044fb1ef9d618ec5e95dde3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4B 5824 bytes
font_01_sfnt_off00007e37.bin
b2a8853372f0f941b848561b1db113285d721e4d920d662afeb3517b8c0195fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E37 16412 bytes
font_02_sfnt_off0000b04b.bin
acbe9d2b3848a3df88f22c695ac3f1118044a02cc6b075e0b4d8fd68c638ca0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB04B 10256 bytes

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